| Microsoft Windows Help General Index Format | |
| Microsoft | |
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GID is an index file used by Windows 95 and 98 opreating systems for indexing Help topics. GID file allow system to access help documents more efficiently. GID file is created during initial Help application launch and updated and overwritten during subsequent access.
GID file stores index of HLP help files.
| .a2theme | Aston 2 Theme Format |
| .acb | Adobe Color Book Format |
| .acbl | Adobe Color Book Format |
| .aco | Adobe Photoshop Color Palette And Swatches Format |
| .acrobatsecuritysettings | Adobe Acrobat Security Settings Format |
| .acrodata | Adobe Acrobat Data Format |
| .acv | Adobe Photoshop Colour Curves Format |
| .acw | Microsoft Accessibility Wizard Format |