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 |
|---|---|---|
| .ADMX | Group Policy Administrative Template File | 4.4 |
| .RMT | Router Firmware File | 4.4 |
| .VGA | VGA Display Driver | 4.3 |
| .SHSH2 | iOS SHSH Blob | 4.3 |
| .REG | Registry File | 4.3 |
| .AML | ACPI Machine Language File | 4.3 |
| .CUR | Windows Cursor Image | 4.3 |
| .CLB | COM+ Catalog File | 4.3 |
| .ANI | Windows Animated Cursor | 4.3 |
| .REGTRANS-MS | Registry Transaction Log File | 4.3 |
| .WDGT | Dashboard Widget | 4.3 |
| .SERVICE | Systemd Service Unit 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 |
| .SEARCHCONNECTOR-MS | Windows Search Connector File | 4.2 |
| .HVE | Windows Registry Hive 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 |
| .HIV | Windows Registry Hive File | 4.2 |
| .THEME | Microsoft Plus! Desktop Theme | 4.2 |
| .VX_ | Compressed Virtual Device Driver File | 4.2 |
| .QVM | Q Virtual Machine | 4.2 |
| .MOD | GRUB Module | 4.2 |
| .LNK | Windows Shortcut | 4.2 |
| .MDMP | Windows Minidump | 4.2 |
| .EBD | Windows EBD System File | 4.1 |
| .LOCKFILE | Mac OS X PLIST Lock 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 |
| .ICO | Icon File | 4.1 |
| .SFCACHE | ReadyBoost Cache File | 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 |
| .DESKLINK | Desktop Shortcut | 4.0 |
| .BASH_HISTORY | Bash History File | 4.0 |
| .ION | File Description File | 4.0 |
| .MUI | Multilingual User Interface File | 4.0 |
| .ETL | Microsoft Event Trace Log File | 4.0 |
| .ZONE.IDENTIFIER | Windows Zone Identifier File | 4.0 |
| .RC1 | Samsung Mobile Device Firmware File | 4.0 |
| .BIN | Router Firmware File | 4.0 |
| .H1S | Windows Assistance Platform Help File | 4.0 |
| .000 | Indexing Service Data File | 4.0 |
| .WLU | Windows Legacy Update | 4.0 |
| .MAPIMAIL | Send To Mail Recipient | 4.0 |
| .MENU | macOS Menu Extra | 4.0 |
| .CGZ | Linux Drivers Archive | 4.0 |
| .LM | Language Model File | 4.0 |
| .PREFPANE | Mac OS X System Preference Pane | 4.0 |
| .TIMER | Systemd Unit Configuration File | 4.0 |
| .BASHRC | Bash Non-Interactive Login Shell File | 4.0 |
| .PWL | Windows Password List | 4.0 |
| .EDJ | Enlightenment Theme File | 4.0 |
| .DAT | Windows Registry Hive File | 4.0 |
| .CM0013 | Samsung Smart TV Index File | 4.0 |
| .MSC | Microsoft Management Console Snap-in Control File | 3.9 |
| .SCR | Windows Screensaver | 3.9 |
| .EFI | Extensible Firmware Interface File | 3.9 |
| .CAB | Windows Cabinet File | 3.9 |
| .FX | ReadyBoot Trace File | 3.9 |
| .LOG1 | Windows Registry Hive Log File | 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 |
| .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 |
| .MSSTYLES | Windows XP Style | 3.9 |
| .DRPM | Delta RPM File | 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 |
| .73U | TI-73 Explorer Operating System File | 3.8 |
| .PNF | Precompiled INF File | 3.8 |
| .TRX_DLL | Windows Startup File | 3.8 |
| .BASH_PROFILE | Bash Interactive Login Shell File | 3.8 |
| .MTZ | MIUI Theme | 3.8 |
| .LIBRARY-MS | Windows Library Description File | 3.8 |
| .SBN | Cisco IP Phone Firmware File | 3.8 |
| .0 | Android CA Digital Certificate | 3.8 |
| .WEBPNP | Web Point and Print File | 3.8 |
| .PDR | Windows Port Driver | 3.8 |
| .HHK | HTML Help Index | 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 |
| .IMG3 | iPhone IMG3 File | 3.8 |
| .NLT | Windows Transliteration File | 3.8 |
| .MUI_CCCD5AE0 | Hid User Library | 3.8 |
| .PLASMOID | Plasma Widget | 3.8 |
| .IOPLIST | Mac OS X IOPLIST File | 3.8 |
| .DIAGCAB | Troubleshooting Pack Cabinet File | 3.7 |
| .DRV | Device Driver | 3.7 |
| .HDMP | Windows Heap Dump | 3.7 |
| .CI | Windows Content Indexer Catalog File | 3.7 |
| .NLS | Microsoft National Language Support File | 3.7 |
| .POL | Windows Policy File | 3.7 |
| .PPD | PostScript Printer Description File | 3.7 |
| .NB0 | Device Boot Loader Image | 3.7 |
| .SDT | Siemens Desktop Theme File | 3.7 |
| .CAT | Windows Catalog File | 3.7 |
| .CPL | Windows Control Panel Item | 3.7 |
| .MSP | Windows Installer Patch | 3.7 |
| .CANNEDSEARCH | Apple Predefined Search | 3.7 |
| .WDF | Windows Driver Foundation File | 3.7 |
| .SAVEDSEARCH | Spotlight Saved 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 |
| .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 |
| .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 |
| .PRF | Windows System File | 3.5 |
| .IME | Windows Input Method Editor File | 3.5 |
| .CONFIGPROFILE | Apple Configuration Profile | 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 |
| .PANIC | Kernel Panic File | 3.5 |
| .SWP | Swap File | 3.5 |
| .DFU | iOS DFU File | 3.5 |
| .SCHEMAS | GConf Schema Definition File | 3.5 |
| .NTFS | NTFS Partition File | 3.5 |
| .EMERALD | Emerald Theme | 3.5 |
| .CPQ | Compaq OEM Disc Configuration File | 3.5 |
| .TDZ | Drobo Firmware File | 3.5 |
| .JOURNAL | Linux Journald Event Log | 3.5 |
| .B84 | TI-84 Plus CE Bundle Image | 3.5 |
| .LEX | Spelling Dictionary File | 3.5 |
| .89U | TI-89 Titanium Operating System File | 3.5 |
| .UTV | SmartCast TV Firmware Update | 3.5 |
| .SHSH | iPhone/iPod Touch SHSH Blob File | 3.5 |
| .CHG | Windows Net Logon File | 3.5 |
| .FFX | Microsoft Find Fast Index | 3.5 |
| .386 | Windows Virtual Device Driver | 3.5 |
| .LST | GRUB Boot List File | 3.5 |
| .WER | Windows Error Report | 3.5 |
| .AOS | ARCHOS PCtablet Firmware File | 3.5 |
| .DEV | Windows Device Driver File | 3.4 |
| .HCD | Samsung Android Firmware File | 3.4 |
| .BLF | CLFS Base Log 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 |
| .KO | Linux Kernel Module File | 3.4 |
| .PROFILE | Bash Shell Profile | 3.4 |
| .EVT | Windows Event Viewer Log File | 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 |
| .DIMAX | DiMAX Firmware Image File | 3.3 |
| .IM4P | IMG4 Payload File | 3.3 |
| .STR | Windows Screensaver File | 3.3 |
| .DEVICEMETADATA-MS | Device Metadata Package | 3.3 |
| .TRASHINFO | Linux Trash Metadata File | 3.3 |
| .KDZ | LG Mobile Device Firmware | 3.3 |
| .PROVISIONPROFILE | Apple Provision Profile | 3.3 |
| .METADATA_NEVER_INDEX | Spotlight Never Index File | 3.3 |
| .PRINTEREXPORT | Windows Printer Migration File | 3.3 |
| .GROUP | Windows Contacts Group File | 3.3 |
| .KWI | Toyota Entune Update File | 3.3 |
| .FLG | Puppy Linux Partition Flag 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 |
| .ATAHD | ATA Hard Drive Flag File | 3.3 |
| .NBH | ROM Update Utility Image File | 3.3 |
| .FFO | Find Fast Document Properties Cache | 3.3 |
| .GRP | Windows Program Manager Group | 3.3 |
| .MI4 | Audio Player Firmware File | 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 |
| .PRO | TurboIntegrator Process Definition File | 3.2 |
| .KBD | Keyboard Layout Script | 3.2 |
| .EVTX | Windows 7 Event Log File | 3.2 |
| .MYDOCS | Send To My Documents | 3.2 |
| .ICL | Windows Icon Library File | 3.2 |
| .THUMBNAILS | Android Thumbnails Folder | 3.1 |
| .KS | Kickstart File | 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 |
| .RCV | BIOS Recovery File | 3.0 |
| .SEFW | Secure Element Firmware | 3.0 |
| .EFIRES | EFI Image File | 3.0 |
| .SCF | Shell Command File | 3.0 |
| .BK2 | Windows Indexing Service Data File | 3.0 |
| .CHT | Windows Chinese Traditional Noise-Word List File | 3.0 |
| .FTR | IRIX File Type Rules File | 3.0 |
| .IMG2 | iPhone Firmware Image | 3.0 |
| .4 | Unix Section 4 Manual Page | 3.0 |
| .RFW | Rockchip Firmware File | 3.0 |
| .DLX | Renamed DLL File | 3.0 |
| .OZIP | OPPO Smartphone Firmware Update | 3.0 |
| .WGZ | S60 Web Runtime Widget Package | 3.0 |
| .2 | Unix Section 2 Manual Page | 3.0 |
| .HPJ | Help Project File | 3.0 |
| .CHS | Windows Chinese Noise-Word List File | 3.0 |
| .MMV | Magnex Firmware File | 3.0 |
| .CMO | ASUS BIOS File | 3.0 |
| .TRASH | ChromeOS Trash Storage | 3.0 |
| .DIAGPKG | Troubleshooting Pack File | 3.0 |
| .GMMP | WCS Gamut Map Model Profile | 3.0 |
| .MEM | Parallels Desktop Memory Dump File | 3.0 |
| .SPRX | Signed PlayStation Relocatable Executable | 3.0 |
| .IFW | INTUS Firmware File | 3.0 |
| .KC | macOS Kernel Extension Boot File | 3.0 |
| .ISDATA | Icon Services Data | 3.0 |
| .XFB | Xserve RAID Firmware Binary File | 3.0 |
| .UCE | Windows UCE System File | 3.0 |
| .SIN | Sony Xperia Firmware File | 3.0 |
| .TBRES | Microsoft Store TokenBroker Cache File | 3.0 |
| .MUN | Windows System Resource Archive | 3.0 |
| .ESCOPY | ES File Explorer File Manager Temporary 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 |
| .DOCK | Mac OS X Dock Extra | 2.8 |
| .DSS | DCC Active Designer File | 2.8 |
| .KEY | Android Passcode File | 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 |
| .FFA | Find Fast Status File | 2.8 |
| .FL1 | Lenovo BIOS Update 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 |
| .VDEX | Validated Dalvik Executable File | 2.7 |
| .RC2 | Samsung Mobile Device Firmware File | 2.7 |
| .IUS | InfoTMIC Firmware Update File | 2.7 |
| .JETKEY | iOS Support Jet File | 2.6 |
| .IDI | EVA Controller Event Log | 2.6 |
| .DIC | Windows 10 Custom Spelling Dictionary | 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 |
| .DIAGCFG | Troubleshooting Pack Configuration File | 2.5 |
| .WPH | Phoenix BIOS File | 2.5 |
| .KL | Android Key Layout File | 2.5 |
| .PUSH_DEVICEID | Android Device Identification File | 2.5 |
| .HSH | Windows Catalog Search Index 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 |
| .RCO | PlayStation Portable Resource File | 2.5 |
| .IPTHEME | IconPackager Raw Theme File | 2.5 |
| .LPD | Lookout Protocol Driver 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 |
| .FID | Microsoft Catalog Indexing Service File | 2.3 |
| .JPN | Windows Japanese Noise-Word List File | 2.3 |
| .TA | Sony Firmware 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 |
| .ITS | Internet Document Set | 2.0 |
| .DUB | Windows Spelling Dictionary Identifier | 2.0 |
| .B83 | TI-83 Premium CE Bundle Image | 2.0 |
| .KOR | Windows Korean Noise-Words List File | 2.0 |
| .ROKU | Roku TV Firmware Update | 2.0 |
| .BBFW | Apple Baseband Firmware Update | 2.0 |
| .XGF | Xiegu G Series Firmware Update | 2.0 |
| .TCO2 | TI-Nspire CX II Operating System File | 2.0 |
| .MRM | MIUI Theme Metadata | 2.0 |
| .MRC | MIUI Theme Content Package | 2.0 |
| .FTG | Full Text Group | 2.0 |
| .TNO | TI-Nspire Operating System File | 2.0 |
| .FFL | Find Fast Document List | 2.0 |
| .ANN | Windows Help Annotations | 1.8 |
| .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 |