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System Files
The System Files category includes files related to Mac, Windows, and Linux operating systems. Some examples include system libraries, icons, themes, and device drivers. Files output by the system are also included in this category.
Common system file extensions include .DLL, .DRV, .SYS, and .CAB.
| File Extension | File Type | Popularity |
|---|---|---|
| .73U | TI-73 Explorer Operating System File | 150 |
| .MAPIMAIL | Send To Mail Recipient | 150 |
| .EBD | Windows EBD System File | 155 |
| .ADMX | Group Policy Administrative Template File | 156 |
| .HIV | Windows Registry Hive File | 156 |
| .REG | Registry File | 157 |
| .ICONPACKAGE | IconPackager Theme File | 160 |
| .HTT | Hypertext Template File | 165 |
| .AML | ACPI Machine Language File | 167 |
| .CUR | Windows Cursor | 167 |
| .REGTRANS-MS | Registry Transaction Log File | 168 |
| .PCK | System Center Configuration Manager Package File | 169 |
| .ANI | Windows Animated Cursor | 173 |
| .DESKTHEMEPACK | Windows 8 Desktop Theme Pack File | 174 |
| .DLL | Dynamic Link Library | 174 |
| .DVD | DOS Device Driver | 176 |
| .BASH_HISTORY | Bash History File | 176 |
| .DESKLINK | Desktop Shortcut | 176 |
| .SEARCHCONNECTOR-MS | Windows Search Connector File | 177 |
| .LNK | Windows Shortcut | 177 |
| .FTF | FlashTool Firmware File | 178 |
| .WDGT | Dashboard Widget | 178 |
| .ION | File Description File | 179 |
| .SCR | Windows Screensaver | 179 |
| .VGA | VGA Display Driver | 180 |
| .CLB | COM+ Catalog File | 180 |
| .DMP | Windows Memory Dump | 180 |
| .ICNS | macOS Icon Resource File | 181 |
| .CPL | Windows Control Panel Item | 182 |
| .PK2 | Silkroad Online Game Data File | 182 |
| .NFO | System Information File | 183 |
| .MDMP | Windows Minidump | 184 |
| .LIBRARY-MS | Windows Library Description File | 186 |
| .NT | Windows NT Startup File | 186 |
| .THEME | Microsoft Plus! Desktop Theme | 187 |
| .QVM | Q Virtual Machine | 187 |
| .INF_LOC | Windows Driver Information Cache File | 187 |
| .ICO | Icon File | 188 |
| .LOG1 | Windows Registry Hive Log File | 188 |
| .SYS | Windows System File | 189 |
| .ASEC | Android Secure Application File | 192 |
| .SFCACHE | ReadyBoost Cache File | 192 |
| .RC1 | Samsung Mobile Device Firmware File | 192 |
| .CAB | Windows Cabinet File | 193 |
| .MSC | Microsoft Management Console Snap-in Control File | 194 |
| .MANIFEST | Windows Application Manifest File | 194 |
| .PROP | Android Build Properties File | 195 |
| .DAT | Windows Registry Hive File | 199 |
| .BIN | Router Firmware File | 199 |
| .H1S | Windows Assistance Platform Help File | 200 |
| .RMT | Router Firmware File | 200 |
| .CI | Windows Content Indexer Catalog File | 200 |
| .CANNEDSEARCH | Apple Predefined Search | 200 |
| .MI4 | Audio Player Firmware File | 200 |
| .EDJ | Enlightenment Theme File | 200 |
| .VX_ | Compressed Virtual Device Driver File | 200 |
| .DRPM | Delta RPM File | 200 |
| .000 | Indexing Service Data File | 200 |
| .FFX | Microsoft Find Fast Index | 200 |
| .CGZ | Linux Drivers Archive | 200 |
| .SERVICE | Systemd Service Unit File | 200 |
| .PREFPANE | Mac OS X System Preference Pane | 200 |
| .PWL | Windows Password List | 200 |
| .FOTA | Firmware Over-the-Air File | 200 |
| .PAT | DiskStation Manager Installation File | 200 |
| .ZONE.IDENTIFIER | Windows Zone Identifier File | 200 |
| .LOCKFILE | Mac OS X PLIST Lock File | 200 |
| .TIMER | Systemd Unit Configuration File | 200 |
| .MUI | Multilingual User Interface File | 200 |
| .ETL | Microsoft Event Trace Log File | 202 |
| .SYS | Motorola Driver File | 204 |
| .SDT | Siemens Desktop Theme File | 207 |
| .MOBILECONFIG | Apple Mobile Configuration File | 208 |
| .BCD | Windows Boot Configuration Data File | 208 |
| .PROFILE | Bash Shell Profile | 208 |
| .BASH_PROFILE | Bash Interactive Login Shell File | 209 |
| .3FS | Puppy Linux Save State File | 209 |
| .MTZ | MIUI Theme | 209 |
| .WDF | Windows Driver Foundation File | 210 |
| .MLC | Microsoft Language Interface Pack | 211 |
| .ELF | Executable and Linkable Format File | 211 |
| .BIO | BIOS File | 212 |
| .MSSTYLES | Windows XP Style | 213 |
| .CM0013 | Samsung Smart TV Index File | 214 |
| .MSP | Windows Installer Patch | 215 |
| .LFS | Samsung Phone params.lfs File | 217 |
| .BOM | Mac OS X Bill of Materials File | 217 |
| .SDB | Custom Application Compatibility Database | 217 |
| .0 | Shared Library Link File | 218 |
| .C32 | Syslinux COM32 Module | 218 |
| .PNF | Precompiled INF File | 219 |
| .WEBPNP | Web Point and Print File | 220 |
| .PDR | Windows Port Driver | 220 |
| .HHK | HTML Help Index | 220 |
| .DIMAX | DiMAX Firmware Image File | 220 |
| .MBR | Master Boot Record File | 220 |
| .GROUP | Windows Contacts Group File | 220 |
| .DEV | Windows Device Driver File | 220 |
| .208 | ASUS Notebook BIOS 208 Update File | 221 |
| .PIT | Samsung Phone Firmware File | 222 |
| .ADM | Administrative Template File | 222 |
| .EFI | Extensible Firmware Interface File | 222 |
| .DIAGCAB | Troubleshooting Pack Cabinet File | 223 |
| .INS | Internet Naming Service File | 224 |
| .FIRM | Boot9Strap 3DS Firmware File | 225 |
| .POL | Windows Policy File | 226 |
| .DRV | Device Driver | 227 |
| .CNT | Help Contents File | 228 |
| .FX | ReadyBoot Trace File | 230 |
| .LOG2 | Windows Registry Hive Log 2 File | 231 |
| .CAT | Windows Catalog File | 231 |
| .IME | Windows Input Method Editor File | 233 |
| .IMG3 | iPhone IMG3 File | 233 |
| .IOPLIST | Mac OS X IOPLIST File | 233 |
| .SAVEDSEARCH | Spotlight Saved Search | 233 |
| .PPD | PostScript Printer Description File | 235 |
| .BASHRC | Bash Non-Interactive Login Shell File | 237 |
| .VXD | Virtual Device Driver | 238 |
| .DTHUMB | Android Data Thumbnail | 238 |
| .HCD | Samsung Android Firmware File | 238 |
| .JOB | Windows Task Scheduler Job File | 238 |
| .WPX | Printer Description File | 240 |
| .SBF | Android System File | 240 |
| .DIT | Active Directory Information Tree File | 240 |
| .KEY | Security Key | 241 |
| .386 | Windows Virtual Device Driver | 242 |
| .CRASH | Mac OS X Crash Log File | 244 |
| .LST | GRUB Boot List File | 244 |
| .SHD | Windows Print Job Shadow File | 244 |
| .PRF | Windows System File | 244 |
| .8XU | TI-83 and TI-84 Plus Operating System File | 244 |
| .AOS | ARCHOS PCtablet Firmware File | 244 |
| .ADML | Group Policy Language-Specific Administrative Template | 247 |
| .MBN | Multi Boot Image | 248 |
| .GRP | Windows Program Manager Group | 250 |
| .THUMBNAILS | Android Thumbnails Folder | 250 |
| .CMO | ASUS BIOS File | 250 |
| .FFO | Find Fast Document Properties Cache | 250 |
| .SBN | Cisco IP Phone Firmware File | 250 |
| .SCHEMAS | GConf Schema Definition File | 250 |
| .SQM | Service Quality Monitoring File | 250 |
| .ITEMDATA-MS | Windows 8 Start Screen Item Data File | 250 |
| .8CU | TI-84 Plus C Operating System File | 250 |
| .SHSH | iPhone/iPod Touch SHSH Blob File | 250 |
| .MOD | GRUB Module | 250 |
| .TDZ | Drobo Firmware File | 250 |
| .CHG | Windows Net Logon File | 250 |
| .SWP | Swap File | 250 |
| .CPQ | Compaq OEM Disc Configuration File | 250 |
| .HLP | Windows Help File | 252 |
| .FLG | Puppy Linux Partition Flag File | 255 |
| .HDMP | Windows Heap Dump | 256 |
| .IDX | Index File | 257 |
| .ODEX | Optimized Dalvik Executable | 258 |
| .PS2 | Microsoft Search Catalog Index File | 260 |
| .WER | Windows Error Report | 261 |
| .BLF | CLFS Base Log File | 262 |
| .2FS | Puppy Linux Save State File | 264 |
| .PFX | PKCS #12 Certificate File | 265 |
| .CHK | Netgear Router Firmware File | 267 |
| .PRO | TurboIntegrator Process Definition File | 267 |
| .FPBF | Mac OS X Burn Folder | 267 |
| .ICL | Windows Icon Library File | 267 |
| .THA | Windows Thai Noise-Words List File | 267 |
| .PRINTEREXPORT | Windows Printer Migration File | 267 |
| .CPI | Codepage Information File | 267 |
| .CHT | Windows Chinese Traditional Noise-Word List File | 271 |
| .NB0 | Device Boot Loader Image | 271 |
| .ADV | Audio Driver File | 271 |
| .KO | Linux Kernel Module File | 272 |
| .HHC | HTML Help Table of Contents | 273 |
| .TRX_DLL | Windows Startup File | 275 |
| .FL1 | Lenovo BIOS Update File | 275 |
| .NBH | ROM Update Utility Image File | 275 |
| .MSSTYLE | Windows XP Unsigned Style | 275 |
| .ATAHD | ATA Hard Drive Flag File | 275 |
| .PRT | Printer Driver File | 278 |
| .DFU | iOS DFU File | 280 |
| .MUI_CCCD5AE0 | Hid User Library | 280 |
| .KS | Kickstart File | 280 |
| .IM4P | IMG4 Payload File | 280 |
| .RUF | Samsung DVD and Blu-ray Player Firmware File | 281 |
| .METADATA_NEVER_INDEX | Spotlight Never Index File | 283 |
| .SAVER | Mac OS X Screen Saver | 283 |
| .STR | Windows Screensaver File | 285 |
| .KEXT | Mac OS X Kernel Extension | 286 |
| .XRM-MS | Microsoft Security Certificate | 286 |
| .CUSTOMDESTINATIONS-MS | Windows 7 Jump List File | 287 |
| .CAP | ASUS BIOS Update File | 294 |
| .XFB | Xserve RAID Firmware Binary File | 300 |
| .CHS | Windows Chinese Noise-Word List File | 300 |
| .HSH | Windows Catalog Search Index File | 300 |
| .FID | Microsoft Catalog Indexing Service File | 300 |
| .DLX | Renamed DLL File | 300 |
| .UCE | Windows UCE System File | 300 |
| .PID | Creative Driver File | 300 |
| .IDI | EVA Controller Event Log | 300 |
| .TA | Sony Firmware File | 300 |
| .LPD | LPD Daemon Print Permissions File | 300 |
| .ESCOPY | ES File Explorer File Manager Temporary File | 300 |
| .PROVISIONPROFILE | Apple Provision Profile | 300 |
| .CONFIGPROFILE | Apple Configuration Profile | 300 |
| .EFIRES | EFI Image File | 300 |
| .MEM | Parallels Desktop Memory Dump File | 300 |
| .IFW | INTUS Firmware File | 300 |
| .GMMP | WCS Gamut Map Model Profile | 300 |
| .RFW | Rockchip Firmware File | 300 |
| .SPL | Windows Print Spool File | 300 |
| .HPJ | Help Project File | 300 |
| .BK2 | Windows Indexing Service Data File | 306 |
| .CPR | Windows Phone Display Settings File | 309 |
| .PS1 | Microsoft Indexing Service Data File | 309 |
| .MUM | Windows Vista Update Package | 312 |
| .GRL | Windows Update Status File | 314 |
| .SO.0 | Unix Shared Library File | 314 |
| .SCF | Windows Explorer Command | 315 |
| .NLS | Microsoft National Language Support File | 320 |
| .BMK | Help Bookmarks | 320 |
| .AUTOMATICDESTINATIONS-MS | Windows Jump List File | 322 |
| .DEVICEMETADATA-MS | Device Metadata Package | 325 |
| .KBD | Keyboard Layout Script | 325 |
| .DYC | Xerox Printer Driver Configuration File | 325 |
| .TRASHES | macOS USB Flash Drive Trash Folder | 329 |
| .ME | Puppy Linux Partition Flag File | 329 |
| .EVTX | Windows 7 Event Log File | 331 |
| .QKY | Quirky Kernel | 333 |
| .PPM | Post Programmable Memory File | 333 |
| .RS | Windows Rating System File | 333 |
| .FFA | Find Fast Status File | 333 |
| .DSS | DCC Active Designer File | 340 |
| .NTFS | NTFS Partition File | 340 |
| .SB | Slax Bundle | 342 |
| .FTS | Full Text Search | 343 |
| .VGD | Generic CADD VGA Driver | 343 |
| .LPD | Lookout Protocol Driver File | 350 |
| .RCO | PlayStation Portable Resource File | 350 |
| .IPTHEME | IconPackager Raw Theme File | 350 |
| .WPH | Phoenix BIOS File | 350 |
| .IPOD | Rockbox Firmware File | 350 |
| .SCAP | EFI Firmware File | 350 |
| .MYDOCS | Send To My Documents | 350 |
| .JPN | Windows Japanese Noise-Word List File | 350 |
| .BUD | Binary Printer Description File | 360 |
| .WGZ | S60 Web Runtime Widget Package | 367 |
| .SPX | System Profiler XML Report | 375 |
| .BK1 | Windows Indexing Service File | 380 |
| .DIAGCFG | Troubleshooting Pack Configuration File | 400 |
| .EVT | Windows Event Viewer Log File | 400 |
| .NETWORKCONNECT | Apple Network Connect Document | 400 |
| .KOR | Windows Korean Noise-Words List File | 400 |
| .RCV | BIOS Recovery File | 400 |
| .CDMP | WCS Device Model Profile | 400 |
| .SIN | Sony Xperia Firmware File | 400 |
| .PLASMOID | Plasma Widget | 400 |
| .FFL | Find Fast Document List | 400 |
| .HVE | Windows Registry Hive File | 400 |
| .REGLNK | Registry Editor Shortcut File | 400 |
| .FTG | Full Text Group | 400 |
| .EMERALD | Emerald Theme | 400 |
| .MMV | Magnex Firmware File | 400 |
| .IUS | InfoTMIC Firmware Update File | 400 |
| .PANIC | Kernel Panic File | 400 |
| .ANN | Help Annotations | 420 |
| .HELP | Mac OS X Help Book | 444 |
| .RC2 | Samsung Mobile Device Firmware File | 450 |
| .DIAGPKG | Troubleshooting Pack File | 450 |
| .INTERNETCONNECT | Apple Internet Connect Document | 450 |
| .RVP | Sharp Blu-ray Player Firmware File | 500 |
| .ITS | Internet Document Set | 500 |
All Categories
Common File Types
Text Files
Data Files
Audio Files
Video Files
eBook Files
3D Images
Raster Images
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Camera Raw Images
Page Layout Files
Spreadsheet Files
Database Files
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Game Files
CAD Files
GIS Files
Web Files
Plugin Files
Font Files
System Files
Settings Files
Encoded Files
Compressed Files
Disk Images
Developer Files
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Misc Files