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File Extensions

A file extension is a short series of letters and/or numbers at the end of a file name, used to indicate the type of file and the software that will run it. File extensions are usually 2-4 characters in length and use a period (.) to separate the file name from the extension.

Extension File Type Program(s) That Open/Run File
.avi Audio/Video Interleaved Windows Media Player, WinAmp, QuickTime
.css Cascading StyleSheet Web Browser + HTML Webpage
.doc Microsoft Word Document Microsoft Word
.docx Microsoft Word Document Microsoft Word
.exe Executable File Usually An Install File
.flv Flash Video File FLV Player
.gif Graphics Interchange Format Image Editors/Viewers, Web Browsers, Etc.
.html HyperText Markup Language File Web Browser
.htm HyperText Markup Language File Web Browser
.jpg Joint Photographic Experts Group File Image Editors/Viewers, Web Browsers, Etc.
.jpeg Joint Photographic Experts Group File Image Editors/Viewers, Web Browsers, Etc.
.midi Musical Instrument Digital Interface Windows Media Player
.mid Musical Instrument Digital Interface Windows Media Player
.mp3 MPEG Layer 3 Sound File Windows Media Player
.mp4 Streaming Media Video File Windows Media Player
.mpeg Motion Picture Experts Group File Windows Media Player, Winamp, Etc.
.mpg Motion Picture Experts Group File Windows Media Player, Winamp, Etc.
.mov QuickTime Movie QuickTime
.qt QuickTime Movie QuickTime
.pdf Portable Document Format Adobe Reader
.png Portable Network Graphics Image Editors/Viewers, Web Browsers, Etc.
.rar RAR Archive 7Zip
.txt Text File Notepad, Wordpad, Vi, Etc.
.wav Wave Sound File Windows Media Player
.zip Zipped File Winzip