File Extension

Text Files

.doc - Microsoft Word Document

.docx - Microsoft Word Open XML Document

.log - Log File

.msg - Outlook Mail Message

.odt - OpenDocument Text Document

.pages - Pages Document

.rtf - Rich Text Format File

.tex - LaTeX Source Document

.txt - Plain Text File

.wpd - WordPerfect Document

.wps - Microsoft Works Word Processor Document

Audio Files

.aif - Audio Interchange File Format

.iff - Interchange File Format

.m3u - Media Playlist File

.m4a - MPEG-4 Audio File

.mid - MIDI File

.mp3 - MP3 Audio File

.mpa - MPEG-2 Audio File

.ra - Real Audio File

.wav - WAVE Audio File

.wma - Windows Media Audio File

Video Files

.3g2 - 3GPP2 Multimedia File

.3gp - 3GPP Multimedia File

.asf - Advanced Systems Format File

.asx - Microsoft ASF Redirector File

.avi - Audio Video Interleave File

.flv - Flash Video File

.m4v - iTunes Video File

.mov - Apple QuickTime Movie

.mp4 - MPEG-4 Video File

.mpg - MPEG Video File

.rm - Real Media File

.srt - SubRip Subtitle File

.swf - Shockwave Flash Movie

.vob - DVD Video Object File

.wmv - Windows Media Video File

Image Files

.bmp Bitmap Image File

.gif Graphical Interchange Format File

.jpg JPEG Image

.png Portable Network Graphic

.psd Adobe Photoshop Document

.thm Thumbnail Image File

M.S. - Office

.xlr - Works Spreadsheet

.xls - Excel Spreadsheet

.xlsx - Microsoft Excel Open XML Spreadsheet

.accdb - Access 2007 Database File

.db - Database File

.dbf - Database File

.mdb - Microsoft Access Database

.doc - M. S. Word

Developer Files

.c C/C++ Source Code File

.class Java Class File

.cpp C++ Source Code File

.cs Visual C# Source Code File

.dtd Document Type Definition Fil

Web Files

.asp - Active Server Page

.aspx - Active Server Page Extended File

.cer - Internet Security Certificate

.cfm - ColdFusion Markup File

.csr - Certificate Signing Request File

.css - Cascading Style Sheet

.htm - Hypertext Markup Language File

.html - Hypertext Markup Language File

.js - JavaScript File

.jsp - Java Server Page

.php - PHP Source Code File

.rss - Rich Site Summary

.xhtml - Extensible Hypertext Markup Language File