Browse file extensions by file type:
System file type extensions (122 extensions)
File extensions used for operating systems use. File formats itself contains no useful data for common users. Files are required for right and heathy run of any operating system.
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System filename extensions
File extensions used for operating systems use. File formats itself contains no useful data for common users. Files are required for right and heathy run of any operating system.
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| Extension | File type description |
| Unix File | |
| Administrator policy template | |
| Animated cursor | |
| Windows Help annotation | |
| ATI DA interface handler | |
| 3D software system | |
| Bookmark file from Windows help | |
| Brother Embroidery system file | |
| Installation File For Windows Mobile | |
| OS/2 Change Control File | |
| Windows or other system content files | |
| Microsoft Word conversion file | |
| Microsoft Windows or DOS international code page | |
| Microsoft MS-DOS code page information file | |
| Windows Control Panel extension | |
| Windows registry hive | |
| Desk Link | |
| Windows Device Driver File | |
| Directory indicator | |
| Soundweb firmware file | |
| Memory dump, screen dump, junk files... | |
| Device Driver | |
| Dr.Halo graphics display driver | |
| Screensaver file | |
| Macintosh OS X Folder Information | |
| DOS Device Driver File | |
| System Dll file | |
| Evnent log file | |
| MS Office Find Fast status file | |
| MS Office Find Fast document list | |
| MS Office Find Fast document properties cache | |
| OS/2 Warp Filter Device Driver | |
| Windows Help file | |
| Windows Help index | |
| Windows sidebar gadget file | |
| MS-DOS Shell Monitor file | |
| Windows Program Group file | |
| Windows Vista file related to Assistance Platform (AP) help | |
| Microsoft Windows Assistance Platform client help file | |
| Keyword index - Microsoft Windows Assistance Platform client help related file | |
| Microsoft Windows Assistance Platform client help file | |
| Microsoft Windows Assistance Platform client help related file | |
| Task metadata file - Microsoft Windows Assistance Platform client help related file | |
| Windows Heap Dump file | |
| HTML Help Table Of Contents file | |
| MS HTML Help Index | |
| Windows NT Registry Hive | |
| Microsoft Help file | |
| Microsoft HyperText Template | |
| Index file | |
| Corel QuickFinder index | |
| Microsoft Outlook Express file | |
| OS/2 installable file system | |
| Autostart CDROM file | |
| Windows installation script | |
| Windows Internet Naming Service | |
| 4DOS description file | |
| Keyboard Script File Layout | |
| Kernel extension | |
| Keyboard definition file | |
| Security file | |
| Lock file (database access control) | |
| Lock file | |
| Windows Visual Stylesheet XML definition file | |
| Manifest files | |
| Microsoft .NET Framework application manifest file | |
| Send mail file | |
| Windows Minidump file | |
| Microsoft Windows XP System32 WBEM file | |
| NTFS master file table file | |
| Device definition (PEN Windows) | |
| File implementing DOS support for Windows DLL's | |
| Windows kernel module | |
| System Dos62 file | |
| Palm memo file | |
| Microsoft management console control file | |
| Word OLE web page storage stream | |
| ActiveMime object file | |
| Windows Installer Patch | |
| WIN Resources Themes Luna file | |
| MultiLanguage Windows resource file | |
| Amiga MUI default class/library | |
| Send to file | |
| Windows NT Startup File | |
| ActiveX control file | |
| LaserJet Printer Cartridge Metric for printer driver | |
| Print device information (Netware) | |
| Printer description (QuarkXpress) | |
| Windows Port Driver, Device Driver | |
| Windows prefetch file | |
| Creative Driver File | |
| EPOC software platform file | |
| HP Graphics Language file (plotter) | |
| Windows Policy File | |
| Mac OS X System Preference Pane | |
| Windows system file | |
| NAT proxy servers file | |
| Spotlight Saved Search | |
| Mac OS X Screen Saver | |
| Visual SourceSafe control file |
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