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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 |
|---|---|---|
| .REG | Registry File | 157 |
| .AML | ACPI Machine Language File | 162 |
| .WDGT | Dashboard Widget | 162 |
| .ADMX | Group Policy Administrative Template File | 165 |
| .CUR | Windows Cursor | 169 |
| .SEARCHCONNECTOR-MS | Windows Search Connector File | 169 |
| .REGTRANS-MS | Registry Transaction Log File | 172 |
| .FTF | FlashTool Firmware File | 173 |
| .CLB | COM+ Catalog File | 173 |
| .ICONPACKAGE | IconPackager Theme File | 173 |
| .ANI | Windows Animated Cursor | 173 |
| .DLL | Dynamic Link Library | 174 |
| .DESKTHEMEPACK | Windows 8 Desktop Theme Pack File | 174 |
| .THEME | Microsoft Plus! Desktop Theme | 176 |
| .EBD | Windows EBD System File | 177 |
| .ICNS | macOS Icon Resource File | 177 |
| .DESKLINK | Desktop Shortcut | 178 |
| .73U | TI-73 Explorer Operating System File | 178 |
| .HTT | Hypertext Template File | 178 |
| .LNK | Windows Shortcut | 178 |
| .DVD | DOS Device Driver | 179 |
| .HVE | Windows Registry Hive File | 180 |
| .VGA | VGA Display Driver | 180 |
| .VX_ | Compressed Virtual Device Driver File | 180 |
| .DMP | Windows Memory Dump | 181 |
| .SCR | Windows Screensaver | 181 |
| .NFO | System Information File | 182 |
| .PK2 | Silkroad Online Game Data File | 182 |
| .RMT | Router Firmware File | 183 |
| .MDMP | Windows Minidump | 183 |
| .QVM | Q Virtual Machine | 184 |
| .NT | Windows NT Startup File | 186 |
| .ICO | Icon File | 187 |
| .PCK | System Center Configuration Manager Package File | 187 |
| .INF_LOC | Windows Driver Information Cache File | 187 |
| .SYS | Windows System File | 188 |
| .LIBRARY-MS | Windows Library Description File | 189 |
| .HIV | Windows Registry Hive File | 190 |
| .CPL | Windows Control Panel Item | 190 |
| .MSC | Microsoft Management Console Snap-in Control File | 191 |
| .ASEC | Android Secure Application File | 191 |
| .SFCACHE | ReadyBoost Cache File | 192 |
| .RC1 | Samsung Mobile Device Firmware File | 192 |
| .MANIFEST | Windows Application Manifest File | 193 |
| .LOG1 | Windows Registry Hive Log File | 195 |
| .BASH_HISTORY | Bash History File | 196 |
| .ION | File Description File | 196 |
| .PAT | DiskStation Manager Installation File | 196 |
| .CAB | Windows Cabinet File | 197 |
| .BIN | Router Firmware File | 197 |
| .PROP | Android Build Properties File | 197 |
| .000 | Indexing Service Data File | 199 |
| .MUI | Multilingual User Interface File | 200 |
| .SERVICE | Systemd Service Unit File | 200 |
| .ITEMDATA-MS | Windows 8 Start Screen Item Data File | 200 |
| .ZONE.IDENTIFIER | Windows Zone Identifier File | 200 |
| .LOCKFILE | Mac OS X PLIST Lock File | 200 |
| .FOTA | Firmware Over-the-Air File | 200 |
| .H1S | Windows Assistance Platform Help File | 200 |
| .DRPM | Delta RPM File | 200 |
| .CM0012 | Configuration Management File | 200 |
| .MENU | macOS Menu Extra | 200 |
| .FFX | Microsoft Find Fast Index | 200 |
| .CI | Windows Content Indexer Catalog File | 200 |
| .TIMER | Systemd Unit Configuration File | 200 |
| .CGZ | Linux Drivers Archive | 200 |
| .NLT | Windows Transliteration File | 200 |
| .MAPIMAIL | Send To Mail Recipient | 200 |
| .PREFPANE | Mac OS X System Preference Pane | 200 |
| .PWL | Windows Password List | 200 |
| .EDJ | Enlightenment Theme File | 200 |
| .ETL | Microsoft Event Trace Log File | 201 |
| .DAT | Windows Registry Hive File | 202 |
| .CM0013 | Samsung Smart TV Index File | 203 |
| .ADM | Administrative Template File | 205 |
| .ELF | Executable and Linkable Format File | 207 |
| .MTZ | MIUI Theme | 208 |
| .FX | ReadyBoot Trace File | 208 |
| .BASH_PROFILE | Bash Interactive Login Shell File | 209 |
| .FIRM | Boot9Strap 3DS Firmware File | 209 |
| .WDF | Windows Driver Foundation File | 210 |
| .SDB | Custom Application Compatibility Database | 211 |
| .MLC | Microsoft Language Interface Pack | 211 |
| .LFS | Samsung Phone params.lfs File | 212 |
| .MSSTYLES | Windows XP Style | 213 |
| .SYS | Motorola Driver File | 215 |
| .MOBILECONFIG | Apple Mobile Configuration File | 215 |
| .PNF | Precompiled INF File | 216 |
| .PIT | Samsung Phone Firmware File | 217 |
| .C32 | Syslinux COM32 Module | 217 |
| .DRV | Device Driver | 218 |
| .0 | Shared Library Link File | 218 |
| .MBR | Master Boot Record File | 219 |
| .DIMAX | DiMAX Firmware Image File | 220 |
| .HHK | HTML Help Index | 220 |
| .POL | Windows Policy File | 220 |
| .GROUP | Windows Contacts Group File | 220 |
| .WEBPNP | Web Point and Print File | 220 |
| .EFI | Extensible Firmware Interface File | 221 |
| .208 | ASUS Notebook BIOS 208 Update File | 221 |
| .DIAGCAB | Troubleshooting Pack Cabinet File | 221 |
| .INS | Internet Naming Service File | 224 |
| .IMG3 | iPhone IMG3 File | 225 |
| .3FS | Puppy Linux Save State File | 225 |
| .MSP | Windows Installer Patch | 226 |
| .DTHUMB | Android Data Thumbnail | 227 |
| .MOD | GRUB Module | 229 |
| .BIO | BIOS File | 229 |
| .SDT | Siemens Desktop Theme File | 230 |
| .BCD | Windows Boot Configuration Data File | 231 |
| .LOG2 | Windows Registry Hive Log 2 File | 231 |
| .CNT | Help Contents File | 233 |
| .IME | Windows Input Method Editor File | 233 |
| .SAVEDSEARCH | Spotlight Saved Search | 233 |
| .IOPLIST | Mac OS X IOPLIST File | 233 |
| .CANNEDSEARCH | Apple Predefined Search | 233 |
| .PROFILE | Bash Shell Profile | 233 |
| .BASHRC | Bash Non-Interactive Login Shell File | 237 |
| .VXD | Virtual Device Driver | 238 |
| .NLS | Microsoft National Language Support File | 238 |
| .JOB | Windows Task Scheduler Job File | 238 |
| .PPD | PostScript Printer Description File | 239 |
| .WPX | Printer Description File | 240 |
| .DIT | Active Directory Information Tree File | 240 |
| .HDMP | Windows Heap Dump | 240 |
| .CAT | Windows Catalog File | 240 |
| .SBF | Android System File | 240 |
| .KEY | Security Key | 242 |
| .CRASH | Mac OS X Crash Log File | 242 |
| .FPBF | Mac OS X Burn Folder | 243 |
| .MUI_CCCD5AE0 | Hid User Library | 243 |
| .BOM | Mac OS X Bill of Materials File | 243 |
| .PDR | Windows Port Driver | 243 |
| .DEV | Windows Device Driver File | 243 |
| .LST | GRUB Boot List File | 244 |
| .SHD | Windows Print Job Shadow File | 244 |
| .ADML | Group Policy Language-Specific Administrative Template | 244 |
| .8XU | TI-83 and TI-84 Plus Operating System File | 244 |
| .PRF | Windows System File | 244 |
| .AOS | ARCHOS PCtablet Firmware File | 244 |
| .NB0 | Device Boot Loader Image | 244 |
| .HLP | Windows Help File | 245 |
| .MBN | Multi Boot Image | 248 |
| .SHSH | iPhone/iPod Touch SHSH Blob File | 250 |
| .PANIC | Kernel Panic File | 250 |
| .CPQ | Compaq OEM Disc Configuration File | 250 |
| .SQM | Service Quality Monitoring File | 250 |
| .SBN | Cisco IP Phone Firmware File | 250 |
| .GRP | Windows Program Manager Group | 250 |
| .CHG | Windows Net Logon File | 250 |
| .TDZ | Drobo Firmware File | 250 |
| .KS | Kickstart File | 250 |
| .SCHEMAS | GConf Schema Definition File | 250 |
| .SWP | Swap File | 250 |
| .386 | Windows Virtual Device Driver | 251 |
| .ODEX | Optimized Dalvik Executable | 252 |
| .IDX | Index File | 257 |
| .HCD | Samsung Android Firmware File | 257 |
| .PS2 | Microsoft Search Catalog Index File | 258 |
| .FLG | Puppy Linux Partition Flag File | 258 |
| .HHC | HTML Help Table of Contents | 258 |
| .WER | Windows Error Report | 261 |
| .PFX | PKCS #12 Certificate File | 263 |
| .DFU | iOS DFU File | 264 |
| .BLF | CLFS Base Log File | 264 |
| .2FS | Puppy Linux Save State File | 264 |
| .ICL | Windows Icon Library File | 267 |
| .PRINTEREXPORT | Windows Printer Migration File | 267 |
| .8CU | TI-84 Plus C Operating System File | 267 |
| .CONFIGPROFILE | Apple Configuration Profile | 267 |
| .CPI | Codepage Information File | 267 |
| .CHK | Netgear Router Firmware File | 267 |
| .PRO | TurboIntegrator Process Definition File | 267 |
| .THA | Windows Thai Noise-Words List File | 267 |
| .KO | Linux Kernel Module File | 268 |
| .KEXT | Mac OS X Kernel Extension | 270 |
| .METADATA_NEVER_INDEX | Spotlight Never Index File | 270 |
| .ADV | Audio Driver File | 271 |
| .CHT | Windows Chinese Traditional Noise-Word List File | 271 |
| .MSSTYLE | Windows XP Unsigned Style | 275 |
| .ATAHD | ATA Hard Drive Flag File | 275 |
| .MI4 | Audio Player Firmware File | 275 |
| .NBH | ROM Update Utility Image File | 275 |
| .TRX_DLL | Windows Startup File | 275 |
| .CUSTOMDESTINATIONS-MS | Windows Jump List File | 276 |
| .PRT | Printer Driver File | 278 |
| .IM4P | IMG4 Payload File | 280 |
| .SAVER | Mac OS X Screen Saver | 283 |
| .STR | Windows Screensaver File | 285 |
| .XRM-MS | Microsoft Security Certificate | 286 |
| .SPL | Windows Print Spool File | 287 |
| .SO.0 | Unix Shared Library File | 287 |
| .RUF | Samsung DVD and Blu-ray Player Firmware File | 288 |
| .MUM | Windows Vista Update Package | 289 |
| .PS1 | Microsoft Indexing Service Data File | 292 |
| .BK2 | Windows Indexing Service Data File | 295 |
| .CAP | ASUS BIOS Update File | 295 |
| .THUMBNAILS | Android Thumbnails Folder | 295 |
| .HSH | Windows Catalog Search Index File | 300 |
| .SIN | Sony Xperia Firmware File | 300 |
| .FID | Microsoft Catalog Indexing Service File | 300 |
| .CMO | ASUS BIOS File | 300 |
| .XFB | Xserve RAID Firmware Binary File | 300 |
| .CHS | Windows Chinese Noise-Word List File | 300 |
| .DLX | Renamed DLL File | 300 |
| .PID | Creative Driver File | 300 |
| .TA | Sony Firmware File | 300 |
| .MEM | Parallels Desktop Memory Dump File | 300 |
| .MUN | Windows System Resource Archive | 300 |
| .DIAGPKG | Troubleshooting Pack File | 300 |
| .LPD | LPD Daemon Print Permissions File | 300 |
| .UCE | Windows UCE System File | 300 |
| .TCO2 | TI-Nspire CX II Operating System File | 300 |
| .KDZ | LG Mobile Device Firmware | 300 |
| .ESCOPY | ES File Explorer File Manager Temporary File | 300 |
| .PROVISIONPROFILE | Apple Provision Profile | 300 |
| .EFIRES | EFI Image File | 300 |
| .HPJ | Help Project File | 300 |
| .IFW | INTUS Firmware File | 300 |
| .RFW | Rockchip Firmware File | 300 |
| .GMMP | WCS Gamut Map Model Profile | 300 |
| .CPR | Windows Phone Display Settings File | 309 |
| .GRL | Windows Update Status File | 314 |
| .SCF | Windows Explorer Command | 314 |
| .NTFS | NTFS Partition File | 317 |
| .BMK | Help Bookmarks | 320 |
| .FL1 | Lenovo BIOS Update File | 320 |
| .FFA | Find Fast Status File | 320 |
| .ME | Puppy Linux Partition Flag File | 322 |
| .DEVICEMETADATA-MS | Device Metadata Package | 325 |
| .KBD | Keyboard Layout Script | 325 |
| .DYC | Xerox Printer Driver Configuration File | 325 |
| .FFO | Find Fast Document Properties Cache | 333 |
| .BUD | Binary Printer Description File | 333 |
| .PPM | Post Programmable Memory File | 333 |
| .RC2 | Samsung Mobile Device Firmware File | 333 |
| .AUTOMATICDESTINATIONS-MS | Windows Jump List File | 333 |
| .EVTX | Windows 7 Event Log File | 336 |
| .IDI | EVA Controller Event Log | 340 |
| .DSS | DCC Active Designer File | 340 |
| .SB | Slax Bundle | 342 |
| .VGD | Generic CADD VGA Driver | 343 |
| .FTS | Full Text Search | 343 |
| .TRASHES | macOS USB Flash Drive Trash Folder | 350 |
| .IPOD | Rockbox Firmware File | 350 |
| .MYDOCS | Send To My Documents | 350 |
| .SCAP | EFI Firmware File | 350 |
| .WPH | Phoenix BIOS File | 350 |
| .IPTHEME | IconPackager Raw Theme File | 350 |
| .LPD | Lookout Protocol Driver File | 350 |
| .JPN | Windows Japanese Noise-Word List File | 350 |
| .RCO | PlayStation Portable Resource File | 350 |
| .PLASMOID | Plasma Widget | 350 |
| .RS | Windows Rating System File | 357 |
| .QKY | Quirky Kernel | 357 |
| .WGZ | S60 Web Runtime Widget Package | 367 |
| .SPX | System Profiler XML Report | 375 |
| .BK1 | Windows Indexing Service File | 380 |
| .EVT | Windows Event Viewer Log File | 400 |
| .NETWORKCONNECT | Apple Network Connect Document | 400 |
| .KOR | Windows Korean Noise-Words List File | 400 |
| .IUS | InfoTMIC Firmware Update File | 400 |
| .EMERALD | Emerald Theme | 400 |
| .MMV | Magnex Firmware File | 400 |
| .DIAGCFG | Troubleshooting Pack Configuration File | 400 |
| .FFL | Find Fast Document List | 400 |
| .RCV | BIOS Recovery File | 400 |
| .TRASHINFO | Linux Trash Metadata File | 400 |
| .89U | TI-89 Titanium Operating System File | 400 |
| .WLU | Windows Legacy Update | 400 |
| .DOCK | Mac OS X Dock Extra | 400 |
| .DUB | Windows Spelling Dictionary Identifier | 400 |
| .LM | Language Model File | 400 |
| .VDEX | Validated Dalvik Executable File | 400 |
| .REGLNK | Registry Editor Shortcut File | 400 |
| .FTG | Full Text Group | 400 |
| .CDMP | WCS Device Model Profile | 400 |
| .ANN | Help Annotations | 420 |
| .HELP | Mac OS X Help Book | 444 |
| .DIFFBASE | Windows Diagnostics Tracking Diffbase File | 450 |
| .INTERNETCONNECT | Apple Internet Connect Document | 450 |
| .ITS | Internet Document Set | 500 |
| .RVP | Sharp Blu-ray Player Firmware File | 500 |
All Categories
Common File Types
Text Files
Data Files
Audio Files
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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
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System Files
Settings Files
Encoded Files
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Developer Files
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Misc Files