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