Common Filetypes

10 December 2006 (updated)

A list of common file types with a brief description and examples of programs that can open these files.

If a file does not appear to have a filetype extension, open the folder it is stored in and click on Tools from the menu, then Folder Options. Click on the View tab and un-tick Hide extensions for known file types.

  • .avi - video file. Open with Windows Media Player
  • .bmp - image file. Open with Paint
  • .cfg - configuration file.
  • .dat - data file.
  • .doc - document file. Open with Word
  • .exe - program file. Double-click to run
  • .gif - image file. Open with Paint
  • .htm - web document. Open with Internet Explorer
  • .html - web document. Open with Internet Explorer
  • .ini - text configuration file. Open with Notepad
  • .jpeg/jpg - image file. Open with Paint
  • .mov - movie file. Open with Quicktime
  • .mpeg/mpg - video file. Open with QuickTime
  • .mp3 - audio file. Open with Windows Media Player
  • .pdf - secure document file. Open with Adobe Reader
  • .pps - slideshow presentation. Open with PowerPoint
  • .ppt - presentation file. Open with PowerPoint
  • .sys - system file.
  • .txt - text file. Open with Notepad
  • .wav - audio file. Open with Windows Media Player
  • .xls - spreadsheet file. Open with Excel
  • .zip - compressed file. Open with WinZip

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