Extensions

A file extension or file name extension is the ending of a file that helps identify the type of file in operating systems, such as Microsoft Windows. In Microsoft Windows, the file name extension is a period that is often followed by three characters, but may also be one, two, or four characters long.

Executable File Extensions

File Extension	File Extension Meaning
.apk	Android package file
.bat	Batch file
.bin	Binary file
.cgi	Common Gateway Interface Script
.com	MS-DOS command file
.exe	Executable file
.jar	Java Archive file
.py	Python file
.wsf	Windows Script File

Audio File Extensions

File Extension	File Extension Meaning
.aif	AIF/Audio Interchange audio file
.cda	CD audio track file
.iff	Interchange File Format
.mid or .midi	MIDI audio file.
.mp3	MP3 audio file
.mpa	MPEG-2 audio file
.wav	WAVE file
.wma	Windows Media audio file
.wpl	Windows Media Player playlist

Video File Extensions

File Extension	File Extension Meaning
.avi	Audio Video Interleave File
.flv	Adobe Flash Video File
.h264	H.264 video File
.m4v	Apple MP4 video File
.mkv	Matroska Multimedia Container
.mov	Apple QuickTime movie File
.mp4	MPEG-4 Video File
.mpg or .mpeg	MPEG video File
.rm	Real Media File
.swf	Shockwave flash File
.vob	DVD Video Object File
.wmv	Windows Media Video File
.3g2	3GPP2 Multimedia File
.3gp	3GPP multimedia File

Text File Extensions

File Extension	File Extension Meaning
.doc and .docx	Microsoft Word file
.odt	OpenOffice Writer document file
.msg	Outlook Mail Message
.pdf	PDF file
.rtf	Rich Text Format File
.tex	A LaTeX document file
.txt	Plain text file
.wks and .wps	Microsoft Works Word Processor Document file
.wpd	WordPerfect document

Spreadsheet File Extensions

File Extension	File Extension Meaning
.ods	OpenOffice Calc spreadsheet file
.xlr	Microsoft Works spreadsheet file
.xls	Microsoft Excel file
.xlsx	Microsoft Excel Open XML spreadsheet file

Presentation File Extensions

File Extension	File Extension Meaning
.key	Keynote presentation
.odp	OpenOffice Impress presentation file
.pps	PowerPoint slide show
.ppt	PowerPoint presentation
.pptx	PowerPoint Open XML presentation

Database File Extensions

File Extension	File Extension Meaning
.accdb	Access 2007 Database File
.csv	Comma separated value file
.dat	Data file
.db or .dbf	Database file
.log	Log file
.mdb	Microsoft Access database file
.pdb	Program Database
.sav	Save file (e.g. game save file)
.sql	SQL/Structured Query Language database file
.tar	Linux / Unix tarball file archive

System Related File Extensions

File Extension	File Extension Meaning
.bak	Backup file
.cab	Windows Cabinet file
.cfg	Configuration file
.cpl	Windows Control panel file
.cur	Windows cursor file
.dll	DLL file
.dmp	Dump file
.drv	Device driver file
.icns	macOS X icon resource file
.ico	Icon file
.ini	Initialization file
.lnk	Windows shortcut file
.msi	Windows installer package
.sys	Windows system file
.tmp	Temporary file

Web File Extensions

File Extension	File Extension Meaning
.asp and .aspx	Active Server Page file
.cer	Internet security certificate
.cfm	ColdFusion Markup file
.cgi or .pl	Perl script file
.css	Cascading Style Sheet file
.htm and .html	HTML/Hypertext Markup Language file
.js	JavaScript file
.jsp	Java Server Page file
.part	Partially downloaded file
.php	PHP Source Code file
.rss	RSS/Rich Site Summary file
.xhtml	XHTML / Extensible Hypertext Markup Language file

Image File Extensions

File Extension	File Extension Meaning
.ai	Adobe Illustrator file
.bmp	Bitmap image File
.gif	GIF/Graphical Interchange Format image
.ico	Icon file
.jpeg or .jpg	JPEG image
.max	3ds Max Scene File
.obj	Wavefront 3D Object File
.png	PNG / Portable Network Graphic image
.ps	PostScript file
.psd	PSD / Adobe Photoshop Document image
.svg	Scalable Vector Graphics file
.tif or .tiff	TIFF image
.3ds	3D Studio Scene
.3dm	Rhino 3D Model