| 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 | |
| .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 | |
| .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 | |
| .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 |
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{ 2 comments… read them below or add one }
What a great resource!
how to add a new system file type