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 |
| .REG | Registry 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 |
| .ANI | Windows Animated Cursor | 4.3 |
| .WDGT | Dashboard Widget | 4.3 |
| .NT | Windows NT Startup File | 4.3 |
| .DLL | Dynamic Link Library | 4.2 |
| .ADMX | Group Policy Administrative Template File | 4.2 |
| .DESKTHEMEPACK | Windows 8 Desktop Theme Pack File | 4.2 |
| .ICONPACKAGE | IconPackager Theme File | 4.2 |
| .MOD | GRUB Module | 4.2 |
| .PK2 | Silkroad Online Game Data File | 4.2 |
| .SERVICE | Systemd Service Unit File | 4.2 |
| .DMP | Windows Memory Dump | 4.2 |
| .ICNS | macOS Icon Resource | 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 |
| .DVD | DOS Device Driver | 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 |
| .HTT | Hypertext Template | 4.1 |
| .QVM | Q Virtual Machine | 4.1 |
| .SYS | Windows System File | 4.1 |
| .ELF | Executable and Linkable Format File | 4.1 |
| .THEME | Microsoft Plus! Desktop Theme | 4.1 |
| .SFCACHE | ReadyBoost Cache File | 4.1 |
| .AML | ACPI Machine Language File | 4.1 |
| .MANIFEST | Windows Application Manifest File | 4.1 |
| .ASEC | Android Secure Application File | 4.1 |
| .ICO | Icon File | 4.0 |
| .PROP | Android Build Properties File | 4.0 |
| .ION | File Description 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 |
| .PWL | Windows Password List | 4.0 |
| .MSC | Microsoft Management Console Snap-in Control File | 4.0 |
| .PREFPANE | Mac OS X System Preference Pane | 4.0 |
| .MAPIMAIL | Send To Mail Recipient | 4.0 |
| .CLB | COM+ Catalog File | 4.0 |
| .ZONE.IDENTIFIER | Windows Zone Identifier File | 4.0 |
| .H1S | Windows Assistance Platform Help File | 4.0 |
| .NLT | Windows Transliteration File | 4.0 |
| .MENU | macOS Menu Extra | 4.0 |
| .RC1 | Samsung Mobile Device Firmware File | 4.0 |
| .FTF | FlashTool 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 |
| .NFO | System Information File | 4.0 |
| .BASH_HISTORY | Bash History File | 4.0 |
| .LOG1 | Windows Registry Hive Log File | 4.0 |
| .EBD | Windows EBD System File | 3.9 |
| .CM0013 | Samsung Smart TV Index File | 3.9 |
| .DESKLINK | Desktop Shortcut | 3.9 |
| .FX | ReadyBoot Trace File | 3.9 |
| .DAT | Windows Registry Hive File | 3.9 |
| .INF_LOC | Windows Driver Information Cache File | 3.9 |
| .000 | Indexing Service Data File | 3.9 |
| .MLC | Microsoft Language Interface Pack | 3.9 |
| .LFS | Samsung Phone params.lfs File | 3.9 |
| .MOBILECONFIG | Apple Mobile Configuration File | 3.9 |
| .SDB | Application Compatibility Database | 3.9 |
| .MSSTYLES | Windows XP Style | 3.9 |
| .EFI | Extensible Firmware Interface File | 3.9 |
| .ITEMDATA-MS | Windows 8 Start Screen Item Data File | 3.9 |
| .SCR | Windows Screensaver | 3.9 |
| .FIRM | Boot9Strap 3DS Firmware File | 3.9 |
| .CAB | Windows Cabinet File | 3.8 |
| .PIT | Samsung Phone Firmware File | 3.8 |
| .MTZ | MIUI Theme | 3.8 |
| .SYS | Motorola Cell Phone Driver | 3.8 |
| .PNF | Precompiled INF File | 3.8 |
| .TRX_DLL | Windows Startup File | 3.8 |
| .BIN | Router Firmware File | 3.8 |
| .PS2 | Microsoft Search Catalog Index 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 |
| .C32 | Syslinux COM32 Module | 3.8 |
| .0 | Shared Library Link File | 3.8 |
| .INS | Internet Naming Service File | 3.8 |
| .FOTA | Firmware Over-the-Air File | 3.8 |
| .BASHRC | Bash Non-Interactive Login Shell File | 3.8 |
| .IMG3 | iPhone IMG3 File | 3.8 |
| .PLASMOID | Plasma Widget | 3.8 |
| .POL | Windows Policy File | 3.7 |
| .PDR | Windows Port Driver | 3.7 |
| .HDMP | Windows Heap Dump | 3.7 |
| .DIAGCAB | Troubleshooting Pack Cabinet File | 3.7 |
| .DRV | Device Driver | 3.7 |
| .BASH_PROFILE | Bash Interactive Login Shell File | 3.7 |
| .DTHUMB | Android Data Thumbnail | 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 |
| .LOG2 | Windows Registry Hive Log 2 File | 3.7 |
| .208 | ASUS Notebook BIOS 208 Update File | 3.7 |
| .SBF | Android System File | 3.7 |
| .ADM | Administrative Template File | 3.7 |
| .SAVEDSEARCH | Spotlight Saved Search | 3.7 |
| .WDF | Windows Driver Foundation File | 3.7 |
| .1 | Unix Section 1 Manual Page | 3.7 |
| .CPL | Windows Control Panel Item | 3.7 |
| .3FS | Puppy Linux Save State File | 3.6 |
| .MSP | Windows Installer Patch | 3.6 |
| .SHD | Windows Print Job Shadow File | 3.6 |
| .TLB | VAX/VMS Text Library | 3.6 |
| .HLP | Windows Help File | 3.6 |
| .JOB | Windows Task Scheduler Job File | 3.6 |
| .73U | TI-73 Explorer Operating System File | 3.6 |
| .SQM | Service Quality Monitoring File | 3.6 |
| .PAT | DiskStation Manager Installation File | 3.6 |
| .MBR | Master Boot Record File | 3.6 |
| .EDJ | Enlightenment Theme File | 3.6 |
| .WPX | Printer Description File | 3.6 |
| .VXD | Virtual Device Driver | 3.6 |
| .MBN | Multi Boot Image | 3.6 |
| .AX | DirectShow Filter | 3.6 |
| .DIT | Active Directory Information Tree File | 3.6 |
| .IM4P | IMG4 Payload File | 3.6 |
| .IDX | Index File | 3.6 |
| .DRPM | Delta RPM File | 3.6 |
| .PRF | Windows System File | 3.5 |
| .BIO | BIOS File | 3.5 |
| .IME | Windows Input Method Editor File | 3.5 |
| .CNT | Help Contents File | 3.5 |
| .OZIP | OPPO Smartphone Firmware Update | 3.5 |
| .DATABASE_UUID | Android Stale Thumbnails Identifier | 3.5 |
| .LST | GRUB Boot List File | 3.5 |
| .ODEX | Optimized Dalvik Executable | 3.5 |
| .SWP | Swap File | 3.5 |
| .CGZ | Linux Drivers Archive | 3.5 |
| .SHSH | iPhone/iPod Touch SHSH Blob File | 3.5 |
| .UTV | SmartCast TV Firmware Update | 3.5 |
| .JOURNAL | Linux Journald Event Log | 3.5 |
| .PANIC | Kernel Panic File | 3.5 |
| .CI | Windows Content Indexer Catalog File | 3.5 |
| .SCHEMAS | GConf Schema Definition File | 3.5 |
| .NTFS | NTFS Partition File | 3.5 |
| .TDZ | Drobo Firmware File | 3.5 |
| .LEX | Spelling Dictionary File | 3.5 |
| .386 | Windows Virtual Device Driver | 3.5 |
| .WER | Windows Error Report | 3.5 |
| .KO | Linux Kernel Module File | 3.5 |
| .FPBF | Mac OS X Burn Folder | 3.4 |
| .STR | Windows Screensaver File | 3.4 |
| .SAVER | Mac OS X Screen Saver | 3.4 |
| .MUM | Windows Vista Update Package | 3.4 |
| .ADML | Group Policy Language-Specific Administrative Template | 3.4 |
| .2FS | Puppy Linux Save State File | 3.4 |
| .PROFILE | Bash Shell Profile | 3.4 |
| .RCV | BIOS Recovery File | 3.4 |
| .HHC | HTML Help Table of Contents | 3.4 |
| .CRASH | Mac OS X Crash Log File | 3.4 |
| .KWI | Toyota Entune Update File | 3.4 |
| .GROUP | Windows Contacts Group File | 3.3 |
| .BLF | CLFS Base Log File | 3.3 |
| .CONFIGPROFILE | Apple Configuration Profile | 3.3 |
| .PROVISIONPROFILE | Apple Provision Profile | 3.3 |
| .CM0012 | Configuration Management File | 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 |
| .DFU | iOS DFU File | 3.3 |
| .8XU | TI-83 and TI-84 Plus Operating System File | 3.3 |
| .BCD | Windows Boot Configuration Data File | 3.3 |
| .HCD | Samsung Android Firmware File | 3.3 |
| .CANNEDSEARCH | Apple Predefined Search | 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 |
| .GRP | Windows Program Manager Group | 3.3 |
| .NBH | ROM Update Utility Image File | 3.3 |
| .89U | TI-89 Titanium Operating System File | 3.3 |
| .AOS | ARCHOS PCtablet Firmware File | 3.2 |
| .SPL | Windows Print Spool File | 3.2 |
| .PRT | Printer Driver File | 3.2 |
| .KBD | Keyboard Layout Script | 3.2 |
| .VDEX | Validated Dalvik Executable File | 3.2 |
| .3 | Unix Section 3 Manual Page | 3.2 |
| .CAP | ASUS BIOS Update File | 3.2 |
| .CHK | Netgear Router Firmware File | 3.2 |
| .MYDOCS | Send To My Documents | 3.2 |
| .8CU | TI-84 Plus C Operating System File | 3.2 |
| .ICL | Windows Icon Library File | 3.2 |
| .KS | Kickstart File | 3.1 |
| .THUMBNAILS | Android Thumbnails Folder | 3.1 |
| .4 | Unix Section 4 Manual Page | 3.1 |
| .FLG | Puppy Linux Partition Flag File | 3.1 |
| .ADV | Audio Driver File | 3.1 |
| .CPI | Codepage Information File | 3.1 |
| .XRM-MS | Microsoft Security Certificate | 3.1 |
| .EVTX | Windows 7 Event Log File | 3.1 |
| .SCF | Shell Command File | 3.0 |
| .HPJ | Help Project File | 3.0 |
| .RFW | Rockchip Firmware File | 3.0 |
| .TRASH | ChromeOS Trash Storage | 3.0 |
| .ISDATA | Icon Services Data | 3.0 |
| .FFX | Microsoft Find Fast Index | 3.0 |
| .MEM | Parallels Desktop Memory Dump File | 3.0 |
| .GMMP | WCS Gamut Map Model Profile | 3.0 |
| .CHG | Windows Net Logon 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 |
| .CUSTOMDESTINATIONS-MS | Windows Jump List File | 3.0 |
| .DEVICEMETADATA-MS | Device Metadata Package | 3.0 |
| .MMV | Magnex Firmware File | 3.0 |
| .SIN | Sony Xperia Firmware File | 3.0 |
| .TRASHINFO | Linux Trash Metadata File | 3.0 |
| .DUB | Windows Spelling Dictionary Identifier | 3.0 |
| .6 | Unix Section 6 Manual Page | 3.0 |
| .MRC | MIUI Theme Content Package | 3.0 |
| .DIMAX | DiMAX Firmware Image 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 |
| .IMG2 | iPhone Firmware Image | 3.0 |
| .DEV | Windows Device Driver File | 2.9 |
| .BK2 | Windows Indexing Service Data File | 2.9 |
| .SO.0 | Unix Shared Library File | 2.9 |
| .0 | Android CA Digital Certificate | 2.9 |
| .TRASHES | macOS USB Flash Drive Trash Folder | 2.9 |
| .SCAP | EFI Firmware File | 2.9 |
| .GRL | Windows Update Status File | 2.9 |
| .PS1 | Microsoft Indexing Service Data File | 2.9 |
| .KEY | Android Passcode File | 2.8 |
| .ME | Puppy Linux Partition Flag File | 2.8 |
| .FFO | Find Fast Document Properties Cache | 2.8 |
| .MSSTYLE | Windows XP Unsigned Style | 2.8 |
| .BOM | Mac OS X Bill of Materials File | 2.8 |
| .LPD | LPD Daemon Print Permissions File | 2.8 |
| .RS | Windows Rating System File | 2.8 |
| .ATAHD | ATA Hard Drive Flag File | 2.8 |
| .CPR | Windows Phone Display Settings File | 2.8 |
| .BMK | Windows Help Bookmarks | 2.8 |
| .IPOD | Rockbox Firmware File | 2.8 |
| .CMO | ASUS BIOS File | 2.8 |
| .5 | Unix Section 5 Manual Page | 2.8 |
| .FTS | Windows Help Full Text Search Index | 2.7 |
| .WGZ | S60 Web Runtime Widget Package | 2.7 |
| .EVT | Windows Event Viewer Log File | 2.7 |
| .AUTOMATICDESTINATIONS-MS | Windows Jump List File | 2.7 |
| .IUS | InfoTMIC Firmware Update File | 2.7 |
| .B84 | TI-84 Plus CE Bundle Image | 2.7 |
| .EMERALD | Emerald Theme | 2.7 |
| .DIAGPKG | Troubleshooting Pack File | 2.7 |
| .RC2 | Samsung Mobile Device Firmware File | 2.7 |
| .CPQ | Compaq OEM Disc Configuration File | 2.7 |
| .DSS | DCC Active Designer File | 2.6 |
| .EFIRES | EFI Image File | 2.6 |
| .IDI | EVA Controller Event Log | 2.6 |
| .DLX | Renamed DLL File | 2.6 |
| .BK1 | Windows Indexing Service File | 2.6 |
| .CHS | Windows Chinese Noise-Word List File | 2.6 |
| .CHT | Windows Chinese Traditional Noise-Word List File | 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 |
| .DOCK | Mac OS X Dock Extra | 2.6 |
| .WPH | Phoenix BIOS File | 2.5 |
| .LPD | Lookout Protocol Driver File | 2.5 |
| .FFA | Find Fast Status File | 2.5 |
| .IPTHEME | IconPackager Raw Theme File | 2.5 |
| .RCO | PlayStation Portable Resource File | 2.5 |
| .PPM | Post Programmable Memory File | 2.5 |
| .FL1 | Lenovo BIOS Update File | 2.5 |
| .ROKU | Roku TV Firmware Update | 2.5 |
| .PUSH_DEVICEID | Android Device Identification File | 2.5 |
| .HSH | Windows Catalog Search Index File | 2.5 |
| .QKY | Quirky Kernel | 2.5 |
| .SELF | Signed Executable and Linkable Format | 2.5 |
| .KL | Android Key Layout File | 2.5 |
| .ESCOPY | ES File Explorer File Manager Temporary File | 2.3 |
| .DIC | Windows 10 Custom Spelling Dictionary | 2.3 |
| .LOCALIZED | macOS Directory Localization File | 2.3 |
| .2 | Unix Section 2 Manual Page | 2.3 |
| .JPN | Windows Japanese Noise-Word List File | 2.3 |
| .FTR | IRIX File Type Rules File | 2.3 |
| .IM4M | IMG4 Manifest | 2.3 |
| .INTERNETCONNECT | Apple Internet Connect Document | 2.3 |
| .BUD | Binary Printer Description File | 2.2 |
| .8 | Unix Section 8 Manual Page | 2.2 |
| .DYC | Xerox Printer Driver Configuration File | 2.2 |
| .ANN | Windows Help Annotations | 2.1 |
| .TCO2 | TI-Nspire CX II Operating System File | 2.0 |
| .MUN | Windows System Resource Archive | 2.0 |
| .DIAGCFG | Troubleshooting Pack Configuration File | 2.0 |
| .SPX | System Profiler XML Report | 2.0 |
| .7 | Unix Section 7 Manual Page | 2.0 |
| .XGF | Xiegu G Series Firmware Update | 2.0 |
| .MRM | MIUI Theme Metadata | 2.0 |
| .TNO | TI-Nspire Operating System File | 2.0 |
| .ITS | Internet Document Set | 2.0 |
| .FID | Microsoft Catalog Indexing Service File | 2.0 |
| .KOR | Windows Korean Noise-Words List File | 2.0 |
| .TA | Sony Firmware File | 2.0 |
| .REGLNK | Registry Editor Shortcut File | 1.8 |
| .B83 | TI-83 Premium CE Bundle Image | 1.7 |
| .HELP | Mac OS X Help Book | 1.6 |
| .FFL | Find Fast Document List | 1.5 |
| .FTG | Full Text Group | 1.5 |
| .BBFW | Apple Baseband Firmware Update | 1.5 |
| .CDMP | WCS Device Model Profile | 1.3 |
| .DIFFBASE | Windows Diagnostics Tracking Diffbase File | 1.3 |
| .RVP | Sharp Blu-ray Player Firmware File | 1.0 |