| Extension |
File Description |
|
Common? |
| .adm | Administrative Template File | | No |
| .ani | Animated Cursor | | No |
| .ann | Help Annotations | | No |
| .bmk | Help Bookmarks | | No |
| .cab | Windows Cabinet File | | Yes |
| .cnt | Help Contents File | | No |
| .cpl | Windows Control Panel | | Yes |
| .cur | Windows Cursor | | No |
| .desklink | Desktop Shortcut | | No |
| .dev | Windows Device Driver File | | No |
| .dmp | Windows Memory Dump | | Yes |
| .drv | Device Driver | | Yes |
| .dss | DCC Active Designer File | | No |
| .dvd | DOS Device Driver | | No |
| .ffa | Find Fast Status File | | No |
| .ffl | Find Fast Document List | | No |
| .ffo | Find Fast Document Properties Cache | | No |
| .ffx | Microsoft Find Fast Index | | No |
| .fpbf | Mac OS X Burn Folder | | No |
| .ftg | Full Text Group | | No |
| .fts | Full Text Search | | No |
| .grp | Windows Program Manager Group | | No |
| .hdmp | Windows Heap Dump | | No |
| .hhc | HTML Help Table of Contents | | No |
| .hhk | HTML Help Index | | No |
| .hlp | Windows Help File | | No |
| .htt | Hypertext Template File | | No |
| .icns | Icon Resource | | No |
| .ico | Icon File | | No |
| .idx | Index File | | No |
| .ini | Initialization File | | Yes |
| .ins | Internet Naming Service File | | No |
| .ion | 4DOS File Description | | No |
| .its | Internet Document Set | | No |
| .kbd | Keyboard Layout Script | | No |
| .kext | Mac OS X Kernel Extension | | No |
| .key | Security Key | | Yes |
| .manifest | Windows Visual Styles File | | No |
| .mapimail | Send To Mail Recipient | | No |
| .mdmp | Windows Minidump | | No |
| .msc | Microsoft Management Console Snap-in Control File | | No |
| .msp | Windows Installer Patch | | No |
| .msstyles | Windows XP Style | | No |
| .mui | MultiLanguage Resource File | | No |
| .mydocs | Send To My Documents | | No |
| .nt | Windows NT Startup File | | No |
| .p7b | PKCS #7 Certificate File | | No |
| .pdr | Windows Port Driver | | No |
| .pfx | PKCS #12 Certificate File | | No |
| .pid | Creative Driver File | | No |
| .pk2 | Silkroad Online Game Data File | | No |
| .pol | Windows Policy File | | No |
| .prefpane | Mac OS X System Preference Pane | | No |
| .prf | Windows System File | | No |
| .prt | Printer Driver File | | No |
| .pwl | Windows Password List | | No |
| .reg | Registry File | | No |
| .savedsearch | Spotlight Saved Search | | No |
| .saver | Mac OS X Screen Saver | | No |
| .scf | Windows Explorer Command | | No |
| .scr | Windows Screensaver | | No |
| .sdb | Custom Application Compatibility Database | | No |
| .str | Windows Screensaver File | | No |
| .swp | Swap File | | No |
| .sys | System File | | Yes |
| .sys | Motorola Driver File | | No |
| .theme | Desktop Theme | | No |
| .vga | VGA Display Driver | | No |
| .vgd | Generic CADD VGA Driver | | No |
| .vxd | Virtual Device Driver | | No |
| .wdgt | Dashboard Widget | | No |
| .wpx | Printer Description File | | No |
