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.
| Extension | File Type | Popularity |
|---|---|---|
| .RMT | Router Firmware File | 4.4 |
| .ADMX | Group Policy Administrative Template File | 4.4 |
| .HVE | Windows Registry Hive File | 4.3 |
| .SHSH2 | iOS SHSH Blob | 4.3 |
| .REG | Registry File | 4.3 |
| .AML | ACPI Machine Language File | 4.3 |
| .VGA | VGA Display Driver | 4.3 |
| .CUR | Windows Cursor Image | 4.3 |
| .REGTRANS-MS | Registry Transaction Log File | 4.3 |
| .CLB | COM+ Catalog File | 4.3 |
| .ANI | Windows Animated Cursor | 4.3 |
| .SERVICE | Systemd Service Unit File | 4.3 |
| .NT | Windows NT Startup File | 4.3 |
| .EDJ | Enlightenment Theme File | 4.3 |
| .WDGT | Dashboard Widget | 4.3 |
| .ICNS | macOS Icon Resource | 4.2 |
| .DLL | Dynamic Link Library | 4.2 |
| .DESKTHEMEPACK | Windows 8 Desktop Theme Pack File | 4.2 |
| .ICONPACKAGE | IconPackager Theme File | 4.2 |
| .SEARCHCONNECTOR-MS | Windows Search Connector File | 4.2 |
| .PK2 | Silkroad Online Game Data File | 4.2 |
| .DVD | DOS Device Driver | 4.2 |
| .DMP | Windows Memory Dump | 4.2 |
| .FTF | FlashTool Firmware File | 4.2 |
| .VX_ | Compressed Virtual Device Driver File | 4.2 |
| .HIV | Windows Registry Hive File | 4.2 |
| .THEME | Microsoft Plus! Desktop Theme | 4.2 |
| .QVM | Q Virtual Machine | 4.2 |
| .MOD | GRUB Module | 4.2 |
| .MDMP | Windows Minidump | 4.2 |
| .LNK | Windows Shortcut | 4.2 |
| .LOCKFILE | Mac OS X PLIST Lock File | 4.1 |
| .EBD | Windows EBD System File | 4.1 |
| .HTT | Hypertext Template | 4.1 |
| .ELF | Executable and Linkable Format File | 4.1 |
| .SYS | Windows System File | 4.1 |
| .PCK | System Center Configuration Manager Package File | 4.1 |
| .SFCACHE | ReadyBoost Cache File | 4.1 |
| .ICO | Icon File | 4.1 |
| .FIRM | Boot9Strap 3DS Firmware File | 4.1 |
| .ASEC | Android Secure Application File | 4.1 |
| .BASH_HISTORY | Bash History File | 4.1 |
| .NFO | System Information File | 4.1 |
| .MANIFEST | Windows Application Manifest File | 4.1 |
| .DESKLINK | Desktop Shortcut | 4.0 |
| .ION | File Description File | 4.0 |
| .PROP | Android Build Properties File | 4.0 |
| .MUI | Multilingual User Interface File | 4.0 |
| .ETL | Microsoft Event Trace Log File | 4.0 |
| .H1S | Windows Assistance Platform Help File | 4.0 |
| .MENU | macOS Menu Extra | 4.0 |
| .CGZ | Linux Drivers Archive | 4.0 |
| .RC1 | Samsung Mobile Device Firmware File | 4.0 |
| .BASHRC | Bash Non-Interactive Login Shell File | 4.0 |
| .TIMER | Systemd Unit Configuration File | 4.0 |
| .LM | Language Model File | 4.0 |
| .PWL | Windows Password List | 4.0 |
| .MAPIMAIL | Send To Mail Recipient | 4.0 |
| .WLU | Windows Legacy Update | 4.0 |
| .PREFPANE | Mac OS X System Preference Pane | 4.0 |
| .ZONE.IDENTIFIER | Windows Zone Identifier File | 4.0 |
| .000 | Indexing Service Data File | 4.0 |
| .CM0013 | Samsung Smart TV Index File | 4.0 |
| .MSC | Microsoft Management Console Snap-in Control File | 4.0 |
| .DAT | Windows Registry Hive File | 4.0 |
| .LOG1 | Windows Registry Hive Log File | 4.0 |
| .BIN | Router Firmware File | 4.0 |
| .EFI | Extensible Firmware Interface File | 3.9 |
| .SCR | Windows Screensaver | 3.9 |
| .FX | ReadyBoot Trace File | 3.9 |
| .ADM | Administrative Template File | 3.9 |
| .CAB | Windows Cabinet File | 3.9 |
| .INF_LOC | Windows Driver Information Cache File | 3.9 |
| .MLC | Microsoft Language Interface Pack | 3.9 |
| .MUI_CCCD5AE0 | Hid User Library | 3.9 |
| .LFS | Samsung Phone params.lfs File | 3.9 |
| .SDB | Application Compatibility Database | 3.9 |
| .C32 | Syslinux COM32 Module | 3.9 |
| .FOTA | Firmware Over-the-Air File | 3.9 |
| .ITEMDATA-MS | Windows 8 Start Screen Item Data File | 3.9 |
| .DRPM | Delta RPM File | 3.9 |
| .MSSTYLES | Windows XP Style | 3.9 |
| .MOBILECONFIG | Apple Mobile Configuration File | 3.9 |
| .PIT | Samsung Phone Firmware File | 3.8 |
| .3FS | Puppy Linux Save State File | 3.8 |
| .SYS | Motorola Cell Phone Driver | 3.8 |
| .73U | TI-73 Explorer Operating System File | 3.8 |
| .MTZ | MIUI Theme | 3.8 |
| .TRX_DLL | Windows Startup File | 3.8 |
| .PNF | Precompiled INF File | 3.8 |
| .BASH_PROFILE | Bash Interactive Login Shell File | 3.8 |
| .WEBPNP | Web Point and Print File | 3.8 |
| .HHK | HTML Help Index | 3.8 |
| .PDR | Windows Port Driver | 3.8 |
| .0 | Android CA Digital Certificate | 3.8 |
| .LIBRARY-MS | Windows Library Description File | 3.8 |
| .SBN | Cisco IP Phone Firmware File | 3.8 |
| .208 | ASUS Notebook BIOS 208 Update File | 3.8 |
| .BCD | Windows Boot Configuration Data File | 3.8 |
| .0 | Shared Library Link File | 3.8 |
| .DIT | Active Directory Information Tree File | 3.8 |
| .MBR | Master Boot Record File | 3.8 |
| .INS | Internet Naming Service File | 3.8 |
| .IMG3 | iPhone IMG3 File | 3.8 |
| .NLT | Windows Transliteration File | 3.8 |
| .PLASMOID | Plasma Widget | 3.8 |
| .IOPLIST | Mac OS X IOPLIST File | 3.8 |
| .DIAGCAB | Troubleshooting Pack Cabinet File | 3.7 |
| .DTHUMB | Android Data Thumbnail | 3.7 |
| .DRV | Device Driver | 3.7 |
| .PS2 | Microsoft Search Catalog Index File | 3.7 |
| .CI | Windows Content Indexer Catalog File | 3.7 |
| .HDMP | Windows Heap Dump | 3.7 |
| .MSP | Windows Installer Patch | 3.7 |
| .NLS | Microsoft National Language Support File | 3.7 |
| .POL | Windows Policy File | 3.7 |
| .NB0 | Device Boot Loader Image | 3.7 |
| .SDT | Siemens Desktop Theme File | 3.7 |
| .PPD | PostScript Printer Description File | 3.7 |
| .CAT | Windows Catalog File | 3.7 |
| .CPL | Windows Control Panel Item | 3.7 |
| .WDF | Windows Driver Foundation File | 3.7 |
| .SAVEDSEARCH | Spotlight Saved Search | 3.7 |
| .CANNEDSEARCH | Apple Predefined Search | 3.7 |
| .SBF | Android System File | 3.7 |
| .BIO | BIOS File | 3.7 |
| .VXD | Virtual Device Driver | 3.6 |
| .SHD | Windows Print Job Shadow File | 3.6 |
| .1 | Unix Section 1 Manual Page | 3.6 |
| .CM0012 | Configuration Management File | 3.6 |
| .HLP | Windows Help File | 3.6 |
| .JOB | Windows Task Scheduler Job File | 3.6 |
| .LOG2 | Windows Registry Hive Log 2 File | 3.6 |
| .PAT | DiskStation Manager Installation File | 3.6 |
| .SQM | Service Quality Monitoring File | 3.6 |
| .AX | DirectShow Filter | 3.6 |
| .WPX | Printer Description File | 3.6 |
| .8CU | TI-84 Plus C Operating System File | 3.6 |
| .CNT | Help Contents File | 3.6 |
| .MBN | Multi Boot Image | 3.6 |
| .CRASH | Mac OS X Crash Log File | 3.6 |
| .KEXT | Mac OS X Kernel Extension | 3.6 |
| .FPBF | Mac OS X Burn Folder | 3.6 |
| .2FS | Puppy Linux Save State File | 3.6 |
| .IDX | Index File | 3.6 |
| .8XU | TI-83 and TI-84 Plus Operating System File | 3.6 |
| .IME | Windows Input Method Editor File | 3.5 |
| .PRF | Windows System File | 3.5 |
| .CONFIGPROFILE | Apple Configuration Profile | 3.5 |
| .ODEX | Optimized Dalvik Executable | 3.5 |
| .ADML | Group Policy Language-Specific Administrative Template | 3.5 |
| .DATABASE_UUID | Android Stale Thumbnails Identifier | 3.5 |
| .CHG | Windows Net Logon File | 3.5 |
| .PANIC | Kernel Panic File | 3.5 |
| .EMERALD | Emerald Theme | 3.5 |
| .SHSH | iPhone/iPod Touch SHSH Blob File | 3.5 |
| .SCHEMAS | GConf Schema Definition File | 3.5 |
| .LEX | Spelling Dictionary File | 3.5 |
| .CPQ | Compaq OEM Disc Configuration File | 3.5 |
| .SWP | Swap File | 3.5 |
| .DUB | Windows Spelling Dictionary Identifier | 3.5 |
| .NTFS | NTFS Partition File | 3.5 |
| .FFX | Microsoft Find Fast Index | 3.5 |
| .TDZ | Drobo Firmware File | 3.5 |
| .DFU | iOS DFU File | 3.5 |
| .B84 | TI-84 Plus CE Bundle Image | 3.5 |
| .89U | TI-89 Titanium Operating System File | 3.5 |
| .JOURNAL | Linux Journald Event Log | 3.5 |
| .UTV | SmartCast TV Firmware Update | 3.5 |
| .386 | Windows Virtual Device Driver | 3.5 |
| .BLF | CLFS Base Log File | 3.5 |
| .LST | GRUB Boot List File | 3.5 |
| .WER | Windows Error Report | 3.5 |
| .AOS | ARCHOS PCtablet Firmware File | 3.5 |
| .KO | Linux Kernel Module File | 3.5 |
| .DEV | Windows Device Driver File | 3.4 |
| .HCD | Samsung Android Firmware File | 3.4 |
| .3 | Unix Section 3 Manual Page | 3.4 |
| .SAVER | Mac OS X Screen Saver | 3.4 |
| .MUM | Windows Vista Update Package | 3.4 |
| .PROFILE | Bash Shell Profile | 3.4 |
| .HHC | HTML Help Table of Contents | 3.4 |
| .ADV | Audio Driver File | 3.4 |
| .CHK | Netgear Router Firmware File | 3.3 |
| .THA | Windows Thai Noise-Words List File | 3.3 |
| .PRINTEREXPORT | Windows Printer Migration File | 3.3 |
| .PROVISIONPROFILE | Apple Provision Profile | 3.3 |
| .METADATA_NEVER_INDEX | Spotlight Never Index File | 3.3 |
| .IM4P | IMG4 Payload File | 3.3 |
| .KDZ | LG Mobile Device Firmware | 3.3 |
| .STR | Windows Screensaver File | 3.3 |
| .KWI | Toyota Entune Update File | 3.3 |
| .GROUP | Windows Contacts Group File | 3.3 |
| .DIMAX | DiMAX Firmware Image File | 3.3 |
| .DEVICEMETADATA-MS | Device Metadata Package | 3.3 |
| .FLG | Puppy Linux Partition Flag File | 3.3 |
| .NETWORKCONNECT | Apple Network Connect Document | 3.3 |
| .BMK | Windows Help Bookmarks | 3.3 |
| .PID | Creative Driver File | 3.3 |
| .RUF | Samsung DVD and Blu-ray Player Firmware File | 3.3 |
| .FFO | Find Fast Document Properties Cache | 3.3 |
| .GRP | Windows Program Manager Group | 3.3 |
| .NBH | ROM Update Utility Image File | 3.3 |
| .BOM | Mac OS X Bill of Materials File | 3.3 |
| .MI4 | Audio Player Firmware File | 3.3 |
| .ATAHD | ATA Hard Drive Flag File | 3.3 |
| .CAP | ASUS BIOS Update File | 3.2 |
| .PRT | Printer Driver File | 3.2 |
| .PRO | TurboIntegrator Process Definition File | 3.2 |
| .KBD | Keyboard Layout Script | 3.2 |
| .VDEX | Validated Dalvik Executable File | 3.2 |
| .EVTX | Windows 7 Event Log File | 3.2 |
| .MYDOCS | Send To My Documents | 3.2 |
| .ICL | Windows Icon Library File | 3.2 |
| .KS | Kickstart File | 3.1 |
| .THUMBNAILS | Android Thumbnails Folder | 3.1 |
| .SPL | Windows Print Spool File | 3.1 |
| .CPI | Codepage Information File | 3.1 |
| .XRM-MS | Microsoft Security Certificate | 3.1 |
| .CUSTOMDESTINATIONS-MS | Windows Jump List File | 3.1 |
| .CPR | Windows Phone Display Settings File | 3.1 |
| .MUN | Windows System Resource Archive | 3.0 |
| .RCV | BIOS Recovery File | 3.0 |
| .SEFW | Secure Element Firmware | 3.0 |
| .EFIRES | EFI Image File | 3.0 |
| .HPJ | Help Project File | 3.0 |
| .TRASHINFO | Linux Trash Metadata File | 3.0 |
| .ESCOPY | ES File Explorer File Manager Temporary File | 3.0 |
| .FTR | IRIX File Type Rules File | 3.0 |
| .CHT | Windows Chinese Traditional Noise-Word List File | 3.0 |
| .CHS | Windows Chinese Noise-Word List File | 3.0 |
| .IMG2 | iPhone Firmware Image | 3.0 |
| .2 | Unix Section 2 Manual Page | 3.0 |
| .RFW | Rockchip Firmware File | 3.0 |
| .4 | Unix Section 4 Manual Page | 3.0 |
| .EVT | Windows Event Viewer Log File | 3.0 |
| .BK2 | Windows Indexing Service Data File | 3.0 |
| .DLX | Renamed DLL File | 3.0 |
| .OZIP | OPPO Smartphone Firmware Update | 3.0 |
| .WGZ | S60 Web Runtime Widget Package | 3.0 |
| .CMO | ASUS BIOS File | 3.0 |
| .SIN | Sony Xperia Firmware File | 3.0 |
| .TBRES | Microsoft Store TokenBroker Cache File | 3.0 |
| .IFW | INTUS Firmware File | 3.0 |
| .SCF | Shell Command File | 3.0 |
| .MMV | Magnex Firmware File | 3.0 |
| .TRASH | ChromeOS Trash Storage | 3.0 |
| .ISDATA | Icon Services Data | 3.0 |
| .UCE | Windows UCE System File | 3.0 |
| .DIAGPKG | Troubleshooting Pack File | 3.0 |
| .GMMP | WCS Gamut Map Model Profile | 3.0 |
| .KC | macOS Kernel Extension Boot File | 3.0 |
| .MEM | Parallels Desktop Memory Dump File | 3.0 |
| .XFB | Xserve RAID Firmware Binary File | 3.0 |
| .SPRX | Signed PlayStation Relocatable Executable | 3.0 |
| .TRASHES | macOS USB Flash Drive Trash Folder | 2.9 |
| .SO.0 | Unix Shared Library File | 2.9 |
| .PS1 | Microsoft Indexing Service Data File | 2.9 |
| .GRL | Windows Update Status File | 2.9 |
| .SCAP | EFI Firmware File | 2.9 |
| .DSS | DCC Active Designer File | 2.8 |
| .KEY | Android Passcode File | 2.8 |
| .DOCK | Mac OS X Dock Extra | 2.8 |
| .ME | Puppy Linux Partition Flag File | 2.8 |
| .MSSTYLE | Windows XP Unsigned Style | 2.8 |
| .FL1 | Lenovo BIOS Update File | 2.8 |
| .LPD | LPD Daemon Print Permissions File | 2.8 |
| .FFA | Find Fast Status File | 2.8 |
| .BK1 | Windows Indexing Service File | 2.8 |
| .IPOD | Rockbox Firmware File | 2.8 |
| .FTS | Windows Help Full Text Search Index | 2.7 |
| .AUTOMATICDESTINATIONS-MS | Windows Jump List File | 2.7 |
| .IUS | InfoTMIC Firmware Update File | 2.7 |
| .RC2 | Samsung Mobile Device Firmware File | 2.7 |
| .IDI | EVA Controller Event Log | 2.6 |
| .DIC | Windows 10 Custom Spelling Dictionary | 2.6 |
| .JETKEY | iOS Support Jet File | 2.6 |
| .SB | Slax Bundle | 2.6 |
| .VGD | Generic CADD VGA Driver | 2.6 |
| .RS | Windows Rating System File | 2.6 |
| .PPM | Post Programmable Memory File | 2.5 |
| .5 | Unix Section 5 Manual Page | 2.5 |
| .6 | Unix Section 6 Manual Page | 2.5 |
| .RCO | PlayStation Portable Resource File | 2.5 |
| .PUSH_DEVICEID | Android Device Identification File | 2.5 |
| .HSH | Windows Catalog Search Index File | 2.5 |
| .DIAGCFG | Troubleshooting Pack Configuration File | 2.5 |
| .7 | Unix Section 7 Manual Page | 2.5 |
| .ROKU | Roku TV Firmware Update | 2.5 |
| .KL | Android Key Layout File | 2.5 |
| .LPD | Lookout Protocol Driver File | 2.5 |
| .WPH | Phoenix BIOS File | 2.5 |
| .IPTHEME | IconPackager Raw Theme File | 2.5 |
| .QKY | Quirky Kernel | 2.4 |
| .8 | Unix Section 8 Manual Page | 2.4 |
| .DYC | Xerox Printer Driver Configuration File | 2.4 |
| .BUD | Binary Printer Description File | 2.4 |
| .LOCALIZED | macOS Directory Localization File | 2.3 |
| .JPN | Windows Japanese Noise-Word List File | 2.3 |
| .TA | Sony Firmware File | 2.3 |
| .FID | Microsoft Catalog Indexing Service File | 2.3 |
| .SELF | Signed Executable and Linkable Format | 2.3 |
| .ANN | Windows Help Annotations | 2.3 |
| .INTERNETCONNECT | Apple Internet Connect Document | 2.3 |
| .SPX | System Profiler XML Report | 2.2 |
| .ITS | Internet Document Set | 2.0 |
| .FFL | Find Fast Document List | 2.0 |
| .TNO | TI-Nspire Operating System File | 2.0 |
| .MRC | MIUI Theme Content Package | 2.0 |
| .MRM | MIUI Theme Metadata | 2.0 |
| .TCO2 | TI-Nspire CX II Operating System File | 2.0 |
| .B83 | TI-83 Premium CE Bundle Image | 2.0 |
| .XGF | Xiegu G Series Firmware Update | 2.0 |
| .FTG | Full Text Group | 2.0 |
| .BBFW | Apple Baseband Firmware Update | 2.0 |
| .KOR | Windows Korean Noise-Words List File | 2.0 |
| .REGLNK | Registry Editor Shortcut File | 1.8 |
| .HELP | Mac OS X Help Book | 1.6 |
| .CDMP | WCS Device Model Profile | 1.5 |
| .DIFFBASE | Windows Diagnostics Tracking Diffbase File | 1.5 |
| .RVP | Sharp Blu-ray Player Firmware File | 1.0 |
| .IM4M | IMG4 Manifest | 1.0 |