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