What is Difference Between HTTP and HTTPS Protocol

Hypertext Transfer Protocol (HTTP) is a protocol used in networking. When you type any web address in your web browser, your browser acts as a client, and the computer having the requested information acts as a server. When client requests for any information from the server, it uses HTTP protocol to do so. The server responds back to the client after the request completes. The response comes in the form of web page which you see just after typing the web address and press “Enter”.

Hypertext Transfer Protocol Secure (HTTPS) is a combination of two different protocols. It is more secure way to access the web. It is combination of Hypertext Transfer Protocol (HTTPS) and SSL/TLS protocol. It is more secure way to sending request to server from a client, also the communication is purely encrypted which means no one can know what you are looking for. This kind of communication is used for accessing those websites where security is required. Banking websites, payment gateway, emails (Gmail offers HTTPS by default in Chrome browser), and corporate sector websites are some great examples where HTTPS protocols are used.

For HTTPS connection, public key trusted and signed certificate is required for the server. These certificate comes either free or it costs few dollars depends on the signing authority. There is one other method for distributing certificates. Site admin creates certificates and loads in the browser of users. Now when user requests information to the web server, his identity can be verified easily.

Here are some major differences between HTTP and HTTPS:

HTTP	HTTPS
URL begins with “http://”	URL begins with “https://”
It uses port 80 for communication	It uses port 443 for communication
Unsecured	Secured
Operates at Application Layer	Operates at Transport Layer
No encryption	Encryption is present
No certificates required	Certificates required

"Every File Extension in the World"

A	Library file (Unix)
A	Object code library
A3L	Authorware 3.x library
A3M	Authorware MacIntosh file (unpackaged)
A3W	Authorware Windows file (unpackaged)
A4L	Authorware 4.x library
A4M	Authorware MacIntosh file (unpackaged)
A4P	Authorware file (packaged without runtime)
A5L	Authorware 5.x library
A5W	Authorware Windows file (unpackaged)
AA	Audible audio file (commonly used for downloadable audio books)
AAM	Authorware shocked file
AAS	Authorware shocked packet
AB	Applix Builder file
ABF	Adobe Binary Screen Font
ABK	Corel Draw AutoBackup
ABK	Backup file (PrintMaster Gold)
ABM	Audio album file (HitPlayer)
ABO	Applix Builder Turbo file
ABP	Barcode profile file in Alver Valley Software's AVS Barcode Source
ABS	Standard GNU compiler output file for a PC platform
ABS	Sometimes used to denote an abstract (as in an abstract or summary of a scientific paper) AutoBackup
ABS	Absolute Database file format
AC$	AutoCAD Undo Info file
AC3	Dolby Digital audio files used on DVDs
ACA	HTTP animation file (Microsoft Agent)
ACA	Project Manager Workbench file
ACB	ACBM Graphic image
ACC	DR-DOS Viewmax file
ACD	Sonic Foundry ACID file
ACE	ACE Archiver Compression file
ACF	HTTP character file (Microsoft Agent)
ACI	ACI development appraisal (ACIWEB)
ACL	Corel Draw 6 keyboard accelerator file
ACL	List file for Microsoft Office
ACM	Interplay compressed sound file (Fallout 1,2, Baulder's Gate)
ACM	Dynamic Link Library (DLL)
ACM	Windows system directory file
ACP	Microsoft Office Assistant Preview file
ACR	American College of Radiology file
ACS	Character structured storage file (Microsoft Agent)
ACT	FoxPro Foxdoc Action Diagram
ACT	Action Presentation
ACT	Microsoft Office Assistant Actor file
ACV	Used to Compress and decompress audio data
AD	After Dark screensaver
Ada	Ada source text file (non-GNAT)
ADB	HP 100LX Organizer Appointment database
ADB	Ada source text body file (GNAT)
ADB	Ability Database file
ADC	Scanstudio 16 color Bitmap Graphic file
ADD	OS/2 adapter driver file used in the boot process
ADF	Amiga disk file
ADI	AutoCAD device-independent binary plotter file
ADL	QEMM Mca adaptor description library
ADM	Windows NT policy template
ADM	After Dark MultiModule screensaver (Microsoft)
ADN	Lotus 1-2-3 Add-In file
ADP	FaxWorks Faxmodem setup file
ADP	Astound Dynamite file
ADP	Microsoft Access project file
ADR	Smart Address address book
ADR	After Dark Randomizer screensaver
ADS	Ada source text specification file (GNAT)
ADT	AdTech Fax file
ADT	ACT! document template file
ADX	Lotus Approach dBase Index
ADX	Archetype Designer Document
ADX	Dynazip Active Delivery script
ADZ	Packed ADF file (Extracts with WinZip)
AE	Author/Editor file (SoftQuad)
AEP	ArcExplorer project file
AF2	ABC FlowCharter 2.0 Flowchart
AF3	ABC Flowchart
AFC	Apple Sound file
AFI	Truevision Bitmap graphic
AFM	HP NewWave Cardfile application
AFM	Adobe metrics
AG	Applix graphic
AI	Corel Trace drawing
AI	Adobe Illustrator drawing
AIF	Audio Interchange File, a sound format used by Silicon Graphics and Macintosh applications
AIFC	Similar to AIF (compressed)
AIFF	Similar to AIF
AIM	AOL Instant Messenger Launch file
AIN	AIN Compressed archive
AIO	APL Input Output
AIS	Velvet Studio Instruments file
AIS	Xerox Arry of Intensity Samples Graphic
AIS	ACDSee Image Sequence
AIX	HP NewWave Cardfile Application data
AKB	HaleyAuthority Authority Knowledge Base File
AKW	Contains all A-keywords in the RoboHELP Help Project Index Designer not associated with topics
ALAW	European Telephony audio
ALB	JASC Image Commander album
ALI	Document file (SAP proprietary format)
ALIAS	Alias Image
ALL	WordPerfect for Windows General printer information file
ALL	Arts & Letters Library
ALS	Alias Image
ALT	WordPerfect Library Menu
AM	Applix SHELF Macro
AM	Advantage database server data dictionary files
AMF	DSMIA/Asylum module music (Crusader,No Remorse,Aladdin)
AMF	Music file (Advanced Module Format)
AMG	ACTOR System image
AMG	AMGC Compressed Archive File
AMI	Annotation file (Cocreate SolidDesigner)
AMR	Adaptive Multi-Rate Codec File
AMS	Extreme's Tracker Module
AMS	Velvet Studio music module (MOD) File
AMU	Sony Photo Album
AN	Text file (Sterling Software) (Groundworks COOL Business Team Model)
AN	Groundworks text file
ANC	Canon Computer Pattern Maker file that is a selectable list of pattern colors
ANI	Microsoft Windows Animated cursor
ANM	DeluxPaint Animation
ANN	Windows 3.x Help annotation
ANS	ANSI Text file
ANT	SimAnt for Windows saved game
ANT	Data file for SFR Calculator (formerly CalcANT)
AOM	Adobe Download Manager Online Manager Shortcut
AOM	Adobe After Effects Output Settings
AOS	Nokia 9000 Add-on software
AOT	Applicatio binary object template file (ZenWorks snAPPshot)
AP	WHAP Compressed Amiga archive
AP	Applix Presents file
APC	Lotus 1-2-3 Printer driver
APC	Compiled application file (Centura Team Developer)
APD	Lotus 1-2-3 Printer driver
APD	Dynamic application library file (Centura Team Developer)
APE	Winamp Plugins AVS File
APE	Monkey's Audio Lossless Audio Compression Format
APF	Project file (Allaire) (Created by Homesite)
APF	Lotus 1-2-3 Printer driver
API	Lotus 1-2-3 Printer driver
API	Adobe Acrobat plugin file
APL	APL Workspace file
APL	Application library file (Centura Team Developer)
APP	Symphony Add-in Application
APP	Generated application or active document (Microsoft Visual FoxPro)
APP	dBase Application Generator Object
APP	DR-DOS Executable Application
APP	Normal mode application file (Centura Team Developer)
APR	Employee Appraiser Performance Review file
APR	Lotus Approach 97 View file
APR	ArcView project file
APS	Advanced patching systems with error checking, (Similar to IPS)
APS	Microsoft Visual C++ file
APT	Text mode application file (Centura Team Developer)
APT	Lotus Approach Data view file
APX	Borland C++ Appexpert database
APX	Lotus Approach Paradox-Specific information file
AQ	Applix data
ARC	SQUASH Compressed archive
ARC	LH ARC (old version) compressed archive
ARF	Automatic Response file
ARF	Advanced Recording File (WebEx)
ARI	Aristotle audio file
ARI	ARI Compressed archive
ARJ	Robert Jung ARJ compressed archive (ARJ)
ARK	ARC File Archiver CPM/Port archive
ARL	AOL v4.0 organizer file
ARR	Atari Cubase Arrangement
ART	Canon Crayola art
ART	Clip Art
ART	Ray Tracer file
ART	First Publisher Raster graphic
ART	AOL Image file compressed using the Johson-Grace compression algorithm
ART	Xara Studio drawing
ARX	AutoCAD Runtime Extension
ARX	ARX Compressed Archive
AS	Applix Spreadsheet
ASA	Microsoft Visual InterDev file
ASC	PGP armored encrypted file
ASC	ASCII text file
ASD	Lotus 1-2-3 Screen driver
ASD	Microsoft Advanced Streaming Format (ASF) description file; opens with NSREX
ASD	Astound Presentation
ASD	WinWord AutoSave file
ASE	Velvet Studio Sample file
ASF	Microsoft Advanced Streaming Format
ASF	StratGraphics Datafile
ASF	Lotus 1-2-3 Screen font
ASF	Music file (Electronic Arts)
ASH	TASM 3.0 Assembly language header
ASI	Borland C++/Turbo C Assembler Include file
ASM	Pro/E assembly file
ASM	Assembler Language source file
ASO	Astound Dynamite Object
ASP	Procomm Plus setup and connection script
ASP	Astound Presentation
ASP	Active Server Page (an HTML file containing a Microsoft server-processed script)
ASRTC	AurelloSoft Removal Tool Configuration File
AST	Claris Works "assistant" file
AST	Astound multimedia file
ASV	DataCAD Autosave file
ASX	Microsoft Advanced Streaming Redirector file
ASX	Video file
ASX	Cheyenne Backup script
AT2	Aldus Persuasion 2.0 Auto Template
ATM	Adobe Type Manager data/info file
ATT	AT&T Group 4 bitmap
ATT	Data file commonly used with Web forms
ATW	AnyTime Deluxe for Windows personal information manager file from Individual Software MultiModule screensaver
AU	Audio U-law (pronounced mu-law)
AU	Sun/NeXT/DEC/UNIX sound file
AUD	Audio file (Westwood Studios) (Kyrandia 3,C&C,RedAlert,C&C:TS)
AUP	Audacity project file
AUX	ChiWriter Auxilliary Dictionary file
AUX	TeX/LaTeX Auxilliary Reference file
AVA	Avagio Publication
AVB	Inculan Anti-Virus virus infected file
AVG	AVG Virus Information Database
AVI	Microsoft Audio Video Interleaved file for Windows movie
AVR	Audio Visual Research file
AVS	Stardent AVS-X Image
AVS	Application Visualization System file
AVX	File Extension (ArcView)
AW	Applix Words file
AW	HP AdvanceWrite Text file
AWD	FaxView Document image
AWE	Acrobat Bookmark XML File
AWK	AWK Script/Program
AWM	Animation Works Movie
AWR	Telsis file for digitally stored audio
AWS	StatGraphics Data file
AXL	ArcIMS XML project file
AXT	ASCII application object template (ZenWorks snAPPshot)
AXX	ARJ compressed file from a multi-volume archive (xx = a number from 01 to 99)
IAM	Autodesk Inventor assembly file B BASIC language source file B_W Atari/Macintosh black and white graphic B&W 1st Reader Mono binary screen image B&W Atari/Macintosh black and white graphic B1 Open source backup and archive file format B1N 1st Reader Mono and color binary screen image B30 ABC Ventura publisher printer font B4 Helix Nuts and Bolts file B8 Raw graphic file (Piclab Plane II) BAD Oracle bad file BAK Backup file BAL Ballade Music score BAND Garageband Project song BAR dBase Application Generator Horizontal menu object BAR Game data file used with Age of Mythology and Age of Empires 3 BAS BASIC source code BAT Batch file BB Papyrus Database backup BBL TeX/BibTeX Bibliographic reference file BBM Deluxe Paint Bitmap image BBS Bulletin Board Sytem text BCH Datalex Entry Point 90 Data file BCH Batch Process Object (dBase Application Generator) BCM Microsoft Works Communications file BCO Bitstream Outline font description file BCP Borland C++ Makefile BCW Borland C++ 4.5 Environment settings file BDB Microsoft Works Dababase file BDF Egret Datafile BDF West Point Bridge Designer file BDF Adobe font file BDR Microsoft Publisher Border BEZ Bitstream Outline font description BF2 Bradford 2 Font BFC Windows 95 Briefcase Document BFM Font Metrics file (Unix/Mainframe) BFX Fax document file (BitFax) BG Microsoft Backgammon Game file BGA OS/2 Graphic array BGI Borland Graphics Interface Driver BGL Microsoft Flight Simulator Scenery file BHF pcAnywhere Host file BI Binary file BIB TeX/BibTeX Literature Database BIB Database BIB Bibliography file (ASCII) BIF Image Capture Board Binary Image black & white graphic BIF GroupWise initialization file BIF Boot information file BIFF XLITE 3D file BIG Electronic Arts Game MOD File BIN Binary file BIO OS/2 Bios file BIT X11 Bitmap BIT Imported map file used by Worms Armageddon and Worms World Party BK JetFax Faxbook file BK Backup file (Generic) BK! WordPerfect for Windows Document backup BK$ Backup file (Generic) BK1 WordPerfect for Windows Timed backup file for document window 1 BK2 WordPerfect for Windows Timed backup file for document window 2 BK3 WordPerfect for Windows Timed backup file for document window 3 BK4 WordPerfect for Windows Timed backup file for document window 4 BK5 WordPerfect for Windows Timed backup file for document window 5 BK6 WordPerfect for Windows Timed backup file for document window 6 BK7 WordPerfect for Windows Timed backup file for document window 7 BK8 WordPerfect for Windows Timed backup file for document window 8 BK9 WordPerfect for Windows Timed backup file for document window 9 BKP TurboVidion Dialog Designer Backup BKS Microsoft Works Spreadsheet Backup BKS IBM BookManager Read bookshelf file BKW FontEdit Fontset mirror image 1 - 249 of 272 terms << Previous 1 2 Next >> C Site configuration for Secure Remote (CheckPoint VPN) C C code C-- Sphinx C-- Source code C00 Ventura Publisher Print file C01 Typhoon wave C86 Computer Innovation (C86) Source code CA Telnet Server Initial cache data file CAB Microsoft cabinet file (program files compressed for software distribution) CAC dBase IV Executable file CACHE Shared Cache file CAD AutoCAD drawing database file CAG Catalog file (Microsoft Clip Gallery v. 2.x,3.x,4.x) CAL SuperCalc 4/5 Spreadsheet CAL Calendar schedule data file CAL CALS Compressed Bitmap CAM Casio camera file CAN Navigator Fax CAP Compressed music file CAP Telix Session Capture file CAP Ventura Publisher Caption CAR AtHome assistant file CAS Comma-delimited ASCII file CAS read-only memory (ROM) file from an Atari Cassette CAT dBase Catalogue file CAT Quicken IntelliCharge categorization file CAT Catalog file format for Advanced Disk Catalog CB Microsoft clean boot file CBC CubiCalc Fuzzy Logic System file CBF Vietcong (game) Pterodon big file CBI Column binary file (used in IBM mainframe systems) CBL Cobol Source code CBM XLib Compiled Bitmap CBR Comic book or paperback RAR file (decompress with RAR utility) CBT Generic Computer based training file CBZ Comic book or paperback ZIP file (decompress with WinZip or similar program) CC C++ Source code CC Visual dBASE custom class file CC3 Close Combat 3 file CCA cc:mail archive file CCB Visual Basic Animated Button configuration file CCC Curtain Call Native bitmap graphic CCD Elaborate Bytes Clone CD mapfile for creating and reading .img files CCE Data file (Calendar Creator Plus) CCF Symphony Communications Configuration file CCF Multimedia Viewer configuration file used in OS/2 CCH Corel Chart CCL Intalk Communication Command Language CCM Lotus CC:Mail "box" file (for example, INBOX.CCM) CCO XBTX Graphics CCO CyberChat data file CCT Macromedia Director Shockwave cast file CDA CD Audio Track CDB CardScan Database (CardScan) CDB TCU Turbo C Utilities Main database CDB Conceptual model backup file (PowerDesigner) CDB Clipboard file CDF Netcdf Graphic file CDF Microsoft Channel Definition Format CDFS Compact Disk filing system CDI Phillips Compact Disk Interactive file CDK Atari Calamus Document CDM Visual dBASE custom data module CDM Conceptual data model file (PowerDesigner Data Architect) (Sybase) CDM Conceptual model file (PowerDesigner) CDR Raw Audio-CD data file CDR Corel Vector Graphic Drawing File CDR Corel Draw Vector drawing file CDT CorelDraw Data file CDT Corel Draw template CDX Microsoft's Visual Foxpro index CDX Corel Draw compressed drawing CE The FarSide Computer Calendar Main CE file CEF Cruzer encrypted file (used to secure files on Cruzer USB flash drives) CEG Tempra Show Bitmap graphic CEL AutoDesk Animator Cel Image CEL CIMFast Event Language file CER Certificate file (MIME x-x509-ca-cert) CEX Caddie Exchange file CF Imake Configurtion file CFB Comptons Multimedia file CFG Configuration file CFL CorelFLOW Chart CFM Visual dBASE Windows customer form CFM Corel FontMaster file CFM Creative FM-Music CFM ColdFusion template CFN Atari Calamus Font data file CFO TCU Turbo C Utilities C form object CFP The Complete Fax Portable fax file CGA Ventura Publisher Display font file CGI Common gateway interface script CGM Computer Graphic Metafile CH Clipper 5 Header CH OS/2 configuration file CH3 Harvard Graphics 3.0 Chart CH4 Charisma 4.0 Presentation CHD FontChameleon Font descriptor CHF pcAnywhere remote control file CHI ChiWriter Document CHK WordPerfect for Windows Temporary file CHK File fragments saved by Windows Disk Defragmenter or ScanDisk CHL Configuration History Log CHM Compiled HTML file CHN Ethnograph Data file CHP Ventura Publisher Chapter file CHR Character Sets (Borland) CHT Harvard Graphics Vector file CHT ChartMaster dBase Interface file CHT ChartViewer file CIF Easy CD Creator image CIF pcAnywhere caller file CIF CalTech Intermediate Graphic CIL Clip Gallery download package file CIM Sim City 2000 file CIN Kodak Cineon Bitmap file CIX TCU Turbo C Utilities Database Index CK1 iD/Apogee Commander Keen 1 data CK2 iD/Apogee Commander Keen 2 data CK3 iD/Apogee Commander Keen 3 data CK4 iD/Apogee Commander Keen 4 data CK5 iD/Apogee Commander Keen 5 data CK6 iD/Apogee Commander Keen 6 data CKB Borland C++ Keyboard mapping file CKF Casio Keyboard File CL Generic LISP Source code CL3 Layout file (Adaptec Easy CD Creator) CLASS Java class CLC TI-83 Plus Flash Debugger file CLG Windows Catalog file CLL Cricket Software Clicker File CLO Cloe Image CLP Quattro Pro Clip art CLP Clipper 5 Compiler Script CLP Windows Clipboard CLR PhotStyler Color defintion CLR 1st Reader Binary color screen image CLS C++ Class Definition CLS Visual Basic Class Module CLX Macro ToolsWorks Macro file CLX Rational XDE file CLX Adobe file CM Craftman Data CMA Database file in plain text format (APPLIX TM1) CMD DOS CP/M command file CMD dBase-II program file CMD 1st Reader External Command Menu CMD Command file for Windows NT (similar to a DOS .BAT file), OS/2 CMF Corel Metafile CMF Creative Music File CMG Chessmaster saved game CMK Card Shop Plus file CMM CEnvi Batch file CMP Address document CMP CorelDRAW 4.0 Postscript Printer Header CMP Route 66 Address Document CMP Microsoft Word for DOS User dictionary CMP JPEG Bitmap CMR MediaPlayer Movie CMV Corel Move animation CMX Corel Presentation Exchange image CMYK Raw cyan, magenta, yellow, and black bytes file CNC Click 'N Create General Program data CNF Configuration file used by Telnet, Windows, and other applications with varying internal formats CNM Windows application menu options and setup file CNQ Compuworks Design Shop file CNT Windows (or other) system content files for the help index and other purposes CNV WordPerfect for Windows Temporary file CNV Conversion files (WS_FTP Pro) files that will be converted from (Example) "HTML-"HTM" for upload CNV Word for Windows Data conversion support file COB COBOL Source code COB trueSpace 2 object COD FORTRAN Compiled code COD dBase Application Generator Template source file COD Video Text file COD Microsoft C compiler output as displayable machine language/assembler with original C as comments COE Xilinx coefficient COL Microsoft Multiplan Spreadsheet COL AutoDesk Animator Color Palette COM Command file (program) CON Simdir Configuration file CP CryptoPad.NET Encrypted document CP8 CP8 256 Gray Scale image CPD Fax Cover document CPD Complaints Desk Script CPD Corel PrintOffice file (drawing) CPE Fax Cover document CPF The Complete Fax (Fax file) CPF CORDIS CPF Editor Contract Preparation Form Submission File CPF Color palette file CPH Image file (Corel Print House) see CPO CPI ColorLab Processed Image bitmap CPI Microsoft MS-DOS code page information CPJ CeQuadrant CD Project CPL Compel Presentation CPL Corel color palette CPL Control Panel Module CPM Turbo Pascal DOS file CPMZ Used to exchange project data between Miradi and ConPro CPO Image file (Corel Print Office) CPP CA-Cricket Presents presentation CPP C++ Source code CPR Corel Presents presentation CPS Coloured postscript CPS Central Point PC Tools Backup CPS Corel Photo House image file CPT Macintosh Compressed Archive CPT dBase Encrypted Memo CPT CA-Cricket Presents Template CPT Corel Photo-Paint image CPX Corel Presentation Exchange compressed drawing CPY Data file (Copy Books) CPY eCopy Desktop or eCopy Paperworks document file CPZ COMPOZ Music Text CRC Cyclical Redundancy Check checksum file CRC Circular reference file (Pro/Engineer) CRD Microsoft Windows 3.x Cardfile CRD Text file used for guitar chords, tablature and lyrics CRF Zortech C++ cross-reference CRH Image file (Microsoft Golf) CRP Visual dBASE custom report CRP dBase IV Encrypted database CRP Corel Presents run-time presentation CRS WordPerfect 5.1 for Windows File Conversion resource CRT Oracle Terminal settings information CRT Crontab file) CRT Certificate file CRU CRUSH Compressed archive CS1 Sinar CaptureShop raw file for Macintosh CS16 Sinar CaptureShop raw file for Macintosh CS4 Sinar CaptureShop raw file for Macintosh CSA Comma deliminated text CSC Corel script file CSG Statistica/w Graph file CSH C shell script files (Hamilton Labs) CSM Script file (Kodak Dc265 Camera) CSM Borland C++ 4.5 Precompiled header CSO Customer service data and outcome file CSP PC Emcee On-Screen image CSS Statistica/w Datasheet CSS Stats+ Datafile CSS Cascading Style Sheet (MIME) CST Macromedia Director "Cast" (resource) file CSV CompuShow Adjusted EGA/VGA Palette CSV Comma-separated values file CT A graphic file associated with the Paint Shop Pro Graphic Editor CT Scitex CT bitmap CT Cheat Engine data file for game cheats CTB AutoCAD Color-dependent Plot Style Table CTC PC Installer Control CTF Symphony Character code translation D2D 2D/3D object file (3-D Fassade Plus) D64 Commodore 64 emulator disk image DAA PowerISO Direct-Access-Archive DAF Digital Anchor data file, a secure database file for the Digital Anchor Database Engine DAO Windows Registry Backup DAP Data access page (Microsoft Access 2000) DAR DVD Architect File DAT A data file extension used to designate an error message in a inbound internet email message (Microsoft Exchange Server v 5.0) DAT WordPerfect Merge Data DAT Extension used for some MPEG files DAT Yahoo Messenger archive file DAT Data file DB Microsoft Access database file DBC Microsoft's Visual FoxPro database container file DBC Database Connect Descriptor File DBF Enable database (can be opened with Excel 97) DBF Oracle 8.1.x tablespace file DBF A dBASE file, a format originated by Ashton-Tate, but understood by Act!, Clipper,FoxPro, Arago, Wordtech, xBase, and similar database ordatabase-related products. DBK Schematic backup file (Orcad Schematic Capture) DBK dBase Database Backup DBK mobile phone backup files generated by Sony Ericsson PC Suite DBO Compiled program file (dBase IV) DBQ Paradox Memo DBS Microsoft Word printer description file DBS PRODAS data file DBS SQL Windows database DBS Managing Your Money data file DBT dBase Text Memo DBV Memo field file (Flexfile 2) DBW Microsoft Windows 9.x Database file (DataBoss) DBX Outlook Express mail folder DBX Microsoft's Visual FoxPro Table file DBX DataBeam image DC CAD file (DesignCAD) DC2 CAD file (DesignCAD) DC5 DataCAD Drawing DCA Visual Basic Active designer cache DCA Document Content Architecture Text file (IBM DisplayWrite) DCF DRM content format DCF Primus-DCF file DCIM Digital Imaging and Communications in Medicine (image and data) DCL AutoCAD Dialog Control Language Description file DCM DCM module DCP Data CodePage (OS/2) DCR Shockwave file DCS Bitmap Graphics (Quark XPress) DCS Datafile (ACT! Activity file) DCS Desktop Color Separation file DCT Database Dictionary file (Clarion Database Developer) DCT Database SpellCheck Dictionary (Harvard Graphics 3.0-Symphony) DCT Microsoft's Visual FoxPro database container file DCU Delphi compiled unit DCX Fax image (based on PCX) DCX Macro file DCX Bitmap Graphics file (Multipage PCX) DCX Microsoft's Visual FoxPro database container file DD Compressed Archive (Macintosh DISKDOUBLER) DDB Bitmap Graphics file DDF Btrieve or Xtrieve Data Definition File DDI Image File (DISKDUPE) DDIF Digital Equipment or Compaq file. Used for storing images and their word processing documents DDP Device Driver Profile (OS/2) DEB Debug Script (DOS Debug) DEF Define Module file (3-D Fassade Plus) DEF C++ definition file DEF Assembly Header file (Geoworks) DEF SmartWare II data DEFI Oracle 7 de-install script DEM A file with USGS standards for Digital Elevation Models (Vista Pro) DEM Graphics file (Vista Pro) DEM Demo file (Descent) DEP Visual Basic Setup Wizard Dependency file DER Certificate file DEV Device Driver DEWF Macintosh SoundCap/SoundEdit recorded instrument file DEZ Encrypted zip file (DES Encryption) DFD Data Flow Diagram Graphic (Prosa) DFI Outline Font description (Digifont) DFL Default Program Settings (Signature) DFM Data Flow Diagram model (Prosa) DFS Sound File (Delight) DFV Printing Form value (Microsoft Word) DGN Microstation95 CAD drawing DGN Bentley Systems drawing file DGS Diagnostics Report DH Dependency Information file (Geoworks) DHP Graphic file (Dr. Halo II-III PIC Format) DHS Shadowgrounds Savegame File DHT Datafile (Gauss) DIA Microsoft Sharepoint temporary file DIB Device-independent bitmap DIC Dictionary file (Lotus Notes, Domino) DIC Dictionary file DICM Digital imaging and communications in medicine file (DICOM) DIF Database file (VisiCalc) DIF Data Interchange Output file DIF Text file (Output from Data Interchange Format) DIF Data Interchange Format spreadsheet DIG Sound Designer I audio DIG Digilink file DIP Graphics file DIR Dialing Directory (ProComm Plus) DIR Directory (VAX) (DEC) DIR Movie (MacroMind Director 4.x) DIR Macromedia Director file DIS Distribution file (VAX Mail) DIS Thesaurus file (CorelDraw) DIS Ray Tracer file DIZ Description file (Description in ZIP) DJS NASCAR Thunder game music file DJS Data Junction Integration map DJVU DjVu compressed image file DKB Graphics file (Ray Traced DKBTrace) DL Image DLD Datafile (Lotus 1-2-3) DLG C++ Dialogue Script DLL Export/Import Filter (CorelDraw) DLL Dynamic-link library file DLS Interactive music architecture (IMA)(Microsoft),(Blood2) DLS Setup file (Norton DiskLock) DLS Downloadable sound DMD Visual dBASE data module DMF X-Trakker music module (MOD) DMF Packed Amiga disk image DMG Macintosh disk image file (copy of contents of a hard disk or CD) DMO Demo file (Derive) DMP Dump file (Screen or Memory) DMS Compressed Archive (Amiga DISKMASHER) DOB Visual Basic User document DOC WordStar document DOC WordPerfect document DOC Microsoft Word document DOC DisplayWrite document DOC Document format (Interleaf) DOC FrameMaker or FrameBuilder document DOG Screen Saver file (Laughing Dog Screen Saver) DOH Dependency Information file (Geoworks) DOS Network Driver file (PKT_DIS.dos) DOS Text file (DOS) DOS External Command file (1st Reader) DOT Line-Type definition (CorelDraw) DOT Word Document Template (Microsoft Word for Windows) DOX Text file (MultiMate 4.x) DOX User document binary form (Visual Basic) DOZ Description out of Zip (VENDINFO) DP Datafile (DataPhile) DP Calendar file (Daily Planner) DPL Borland Delphi 3 packed library DPR Project header (Borland C++) DPT Publication file (Publish-It!) DR9 Directory file DRA Dragon NaturallySpeaking file DRAW Acorn's object-based vector image DRC Design rules check report file (Orcad Schematic Capture) DRG Motion Software Dyno2000 Car Design DRG VLBI and Tied Array Drudge Tasking Document DRG AllyCAD file DRS Display Resource file (WordPerfect for Windows) DRV Device Driver (Required to make a device function) DRV Driver file DRW Lotus Freelance image DRW Micrografx vector graphics file DRW Pro/E drawing DRW Caddie CAD drawing DS4 Vector Graphics (Micrografx) DS4 Micrografx Designer Image DSC Discard file (Oracle) DSD Database file (DataShaper) DSF Micrografx Designer v7.x file DSG DooM saved game DSK Driver file (Novell Netware) DSK Project Desktop file (Borland C++/Turbo Pascal) DSM Digital Sound Module (DSI) DSM Music module file (DSIK) DSM Dynamic Studio music module (MOD) DSN Design (Object System Designer) DSN Schematic file (Orcad Schematic Capture) DSN ODBC Data source DSP Display parameters (Signature) DSP Graphics Display driver Dr. Halo) DSP Microsoft Developer Studio project DSQ Corel QUERY DSR Driver Resource (WordPerfect for Windows) DSR Visual Basic Active designer file DSS Digital Sound file (Digital Soup)) DSS Screensaver file (DCC) DST Distribution file (PC-RDist, by Pyzzo) DST Embroidery machines graphic file DSW Microsoft Developer Studio workspace file DSW Desktop settings (Borland C++ 4.5) DSX Visual Basic Active designer binary file DT_ Data file fork (Macintosh) DTA Datafile (Turbo C++) DTA World Bank's STARS data DTA Data file (EZ-Forms) DTD |SGML Document Type Definition (DTD) file DTED Digital terrain elevation data (geographic data format) DTF Symantec Q&A relational database DTF Database file (PFS-Questions & Answers) DTF Database file for ACDSee DTM Module file (DigiTrakker) DTP Text Document (Timeworks Publisher 3.x) DTP Template file (Pressworks) DTP Desktop layout file (Publish-iT) DUN Microsoft Dial-up Networking Export file DUP Duplicate Backup DUS Readiris font dictionary DV Digital video (MIME) DVC Datafile (Lotus 1-2-3) DVF Graphics file associated with camcorders (DV Studio) DVI Device Independent Document (TeX) (LaTeX) DVP Device parameter file (AutoCAD) DVP Desqview Program information (DESQview) DW2 Drawing file (DesignCAD for Windows) DWC Compressed Archive (DWC) DWD DiamondWare digitized file DWF Drawing Web file (Microsoft WHIP autoCAD reader) DWF Vector graphic (Autodesk) DWG AutoCAD drawing, or older Generic CAD drawing file DWG AutoCAD Drawing DWH Express Tools log file DWI Stepfile format for Dance Dance Revolution simulator DWP Document file (DeScribe) DWS Workspace file (Dyadic) DWT Dreamweaver Web Page Template DX Digital Electric Corporation (DEC) Data exchange file DXB AutoCAD Drawing Exchange Format file DXF Drawing Interchange Format (AutoCAD) DXF Data Exchange File DXF Drawing Interchange (eXchange) format,a text representation of the binary DWG format DXN Fax document (Fujitsu dexNet) DXR Macromedia Director protected (not editable) movie file DYN Datafile (Lotus 1-2-3) BLB Resource archive (DreamWorks),(Neverhood) BLB BLOB file used with various database software BLD BASIC Bloadable picture file BLEND Data file for Blender 3D modeling suite. BLK WordPerfect for Windows Temporary file BLK Alias Wavefront Image BM Windows system Bitmap BM1 Apogee BioMenace data BMA Song format used by Beatmania emulators BMF Corel Gallery file BMF Binary Material File BMK Windows Help bookmark BMP Windows or OS/2 bitmap BN Instrument bank file (AdLib) BNK Instrument Bank file (AdLib) BNK Sound effects bank file (Electronic Arts) BOL Compressed archive library file (Microsoft Booasm.arc) BOM Bill of materials file BOO Microsoft Booasm.arc Compressed archive BOOK Adobe FrameMaker Book BOX Lotus Notes file BPC Business Plan Toolkit Chart BPL Borland Delphi 4 packed library BPS Microsoft Works Document BPT CorelDraw Bitmap fills file BPX Truevision Targa Bitmap BQY BrioQuery file BR Bridge Script BR0 PrintMaster graphics file BRD Eagle Layout file BRK Brooktrout Fax-Mail file BRW Application file associated with financial institution(s) loan applications BRX A file for browsing an index of multimedia options BRZ DbBRZ file for very large Db backup or restore BS_ Microsoft Bookshelf Find Menu shell extension BS1 Apogee Blake Stone data file BSA BSARC Compressed archive BSA Data file used with Bethesda games BSC Fortran Pwbrmake Object BSC MS Developer Studio (MSDev) browser information BSC Apple II Compressed archive BSP Quake map file BTM Batch file used by Norton Utilities BTR Database file (Btrieve 5.1) BUD Backup disk for Quicken BUG Bugs and Problems file BUN CakeWalk Audio Bundle (a MIDI program) BUP Backup BUT Buttons! Button definition BUY Movie data file BV1 WordPerfect for Windows Overflow file below insert point in document 1 BV2 WordPerfect for Windows Overflow file below insert point in document 2 BV3 WordPerfect for Windows Overflow file below insert point in document 3 BV4 WordPerfect for Windows Overflow file below insert point in document 4 BV5 WordPerfect for Windows Overflow file below insert point in document 5 BV6 WordPerfect for Windows Overflow file below insert point in document 6 BV7 Wordperfect for Windows Overflow file below insert point in document 7 BV8 WordPerfect for Windows Overflow file below insert point in document 8 BV9 WordPerfect for Windows Overflow file below insert point in document 9 BW Silicon Graphics Raw red,green and blue bytes file BW SGI Black and White image file BWB Visual Baler Spreadsheet application BWR Kermit Beware buglist BWV Business Wave file BYU BYU Movie BZ Bzip compressed file (Inix) BZ2 Bzip compressed file (Unix) (replaces Bz) E Amiga E Source Code file E EiffelStudio Source File E00 Coverage export file (ArcInfo) EASM SolidWorks eDrawing Electronic Assembly Data File EBJ Error Checking Object file (Geoworks) ECW VECTOR structured graphics files ECW RASTER structured graphics ECW Compressed image files for aerial and satellite map projections ED5 EDMICS image ED6 EDMICS image EDA Ensoniq ASR disk image EDB ROOTS3 Geneological data file EDD Element Definition document (FrameMaker+SGML documents) EDE Ensoniq EPS disk image EDK Ensoniq KT disk image EDQ Ensoniq SQ1/SQ2/KS32 disk image EDS Ensoniq SQ80 disk image EDT Default settings (VAX Edt editor) EDV Ensoniq VFX-SD disk image EEB Button Bar for Equation editor (WordPerfect for Windows) EFA Ensoniq ASR file EFE Ensoniq EPS file EFK Ensoniq KT file EFQ Ensoniq SQ1/SQ2/KS32 file EFS Ensoniq SQ80 file EFT High Resolution Screen Font (ChiWriter) EFV Ensoniq VFX-SD file EFX Fax document (Efax Reader) EFX Fax Document (Everex EFax) EGA EGA Display font (Ventura Publisher) EGM Bentley Systems drawing file EL Lisp Source code (eMacs) ELC eMac Lisp Source code (byte-compiled) ELM Theme-Pack file for (Microsoft FrontPage) ELT Event List Text file (Prosa) EMAIL Microsoft Outlook Express mail message (save to desktop, scan for viruses, then convert to an EML file before opening) EMB Embedded bank File (Everest) EMD ABT Extended MoDule EMF Enhanced Windows Metafile EML Microsoft Outlook Express mail message (MIME RFC 822) EMS Enhanced Menu System Configuration file (PC Tools) EMU Terminal Emulation Data file (BITCOM) EMZ Windows Compressed Enhanced Metafile, a graphic format used in Office and Visio ENC Video file ENC Encoded file (UUENCODEd File, Lotus 1-2-3) ENC Music file (Encore) END Arrow-Head Definition Table (CorelDraw) ENFF Neutral Format ENG Chart Graphics file (EnerGraphics) ENG Dictionary Engine file (Sprint) ENV Environment file (WordPerfect for Windows) ENV Enveloper Macro (WOPR) ENV Adobe Acrobat and Acrobat reader files EPD Publication file (Express Publisher) EPHTML Enhanced Perl-parsed HTML EPI Document file (Express Publisher) EPRT SolidWorkseDrawing CAD file EPS Printer font (Epson, Xerox, Ventura Publisher) EPS Encapsulated Postscript image file EPS Encapsulated Postscript Vector graphics (Adobe Illustrator) EPS2 Adobe Level II Encapsulated Postscript EPSF Encapsulated PostScript EPSI Adobe Encapsulated Postscript Interchange EQN Equation file (WordPerfect for Windows) ER1 ERWin file ERD Entity Relationship Diagram graphic file (Prosa) ERM Entity Relationship Diagram Model file (Prosa) ERR Compilation error file (Microsoft Visual FoxPro) ERR stored error message file ERX ERWin file ESH Extended Shell Batch file (DOS) ESL Distributable support library file (Microsoft Visual FoxPro) ESPS ESPS audio file EST Interactive Cost Estimating 2000 file ESU ESRI Single Use License Information file ET EasiTeach document ETH Document file (Ethnograph 3.x) ETX Structure Enhanced text (SetText) EUI Ensoniq ESP family compacted disk image EVT Event Log (Microsoft Windows NT, 2000) EVY Document (WordPerfect for Windows Envoy) EWD Text Document (Express Publisher for Windows) EWL Microsoft Encarta document EX3 Device Driver file (Harvard Graphics 3.x) EXC Source Code file (Rexx VM/CMS) EXC Exclude file for Optimize (do not process, QEMM) EXC Microsoft Word Exclusion Dictionary file EXE Executable file (program) EXP Saved chat (ICQ) EXP Exported files format EXT ASCII binary transfer file (WS_FTP PRO) (IPSWITCH Software) EXT Extension file (Norton Commander) EXT2 Second extended file system (Linux) EXT3 Third extended file system (Linux) EZP Compressed file (Edify.zip) (Edify Electronic Workforce Backup Utility