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