File Extension Library

A file extension is three or four characters at the end of a filename, such as .DOCX, .PDF or .TXT. File extensions tell you the file type, and which programs can open it. These extensions are used in Microsoft Windows, Mac OS X and Linux Operating Systems.

The most known file extensions

text files

.docx Microsoft Open Word XML Document
.doc Microsoft Word Document
.txt Plain Text File
.rtf Revit Family Template File
.odt OpenOffice/StarOffice File

audio files

.mp3 MP3 Audio File
.wav Wave Audio File
.aac MPEG-2 Advanced Audio Coding File
.wma Windows Media Audio File
.m4a MPEG-4 Audio File

video files

.avi Audio Video Interleave File
.mp4 MPEG-4 Video File
.mov Video Clip
.flv Video File
.mpg MPEG 1 System Stream

data files

.pdf Portable Document Format File
.xls Excel Spreadsheet File
.csv Comma Separated Values File
.ini Initialization/Configuration File
.html Hypertext Markup Language File

compression files

.zip ZIP File
.rar WinRAR Compressed Archive
.7z Compressed File
.tar Consolidated Unix File Archive
.gz GNU Zipped Archive File

executable files

.exe Windows Executable File
.msi Windows Installer File
.bin Binary Disc Image
.app Punch Post
.dmg Disk Copy Disk Image File
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