File Extensions   A filename extension or filename suffix is an extra set of characters usually 3-4 letters that identifies the type of file. For example, in "index.htm," .htm is the file extension, and it identifies the file as an HTML document. This allows computer users (as well as various pieces of software on the computer system) to quickly determine the type of data stored in the file. If a filetype extension should not appear in a filename, open the folder it is stored in and click on “Tools” from the menu, then “Folder Options”. Click on the “View” tab and un-click “Hide Extensions” for known file types. This is a list of common file types, and examples of programs that can open these files: .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 or Photoshop .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 or Photoshop .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 Back to Tip of the Month

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