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 |
| .HVE | Windows Registry Hive File | 4.3 |
| .REG | Registry File | 4.3 |
| .SHSH2 | iOS SHSH Blob | 4.3 |
| .AML | ACPI Machine Language File | 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 |
| .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 |
| .SERVICE | Systemd Service Unit File | 4.2 |
| .PK2 | Silkroad Online Game Data 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 |
| .HIV | Windows Registry Hive File | 4.2 |
| .VX_ | Compressed Virtual Device Driver File | 4.2 |
| .IOPLIST | Mac OS X IOPLIST File | 4.2 |
| .QVM | Q Virtual Machine | 4.2 |
| .MOD | GRUB Module | 4.2 |
| .LNK | Windows Shortcut | 4.2 |
| .MDMP | Windows Minidump | 4.2 |
| .ELF | Executable and Linkable Format File | 4.2 |
| .SEARCHCONNECTOR-MS | Windows Search Connector File | 4.2 |
| .LOCKFILE | Mac OS X PLIST Lock File | 4.1 |
| .EBD | Windows EBD System File | 4.1 |
| .HTT | Hypertext Template | 4.1 |
| .SYS | Windows System File | 4.1 |
| .SFCACHE | ReadyBoost Cache File | 4.1 |
| .PCK | System Center Configuration Manager Package 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 |
| .MUI | Multilingual User Interface File | 4.0 |
| .ETL | Microsoft Event Trace Log File | 4.0 |
| .MENU | macOS Menu Extra | 4.0 |
| .ZONE.IDENTIFIER | Windows Zone Identifier File | 4.0 |
| .TIMER | Systemd Unit Configuration File | 4.0 |
| .H1S | Windows Assistance Platform Help File | 4.0 |
| .CGZ | Linux Drivers Archive | 4.0 |
| .WLU | Windows Legacy Update | 4.0 |
| .RC1 | Samsung Mobile Device Firmware File | 4.0 |
| .LM | Language Model File | 4.0 |
| .THA | Windows Thai Noise-Words List File | 4.0 |
| .PWL | Windows Password List | 4.0 |
| .MAPIMAIL | Send To Mail Recipient | 4.0 |
| .PREFPANE | Mac OS X System Preference Pane | 4.0 |
| .BASHRC | Bash Non-Interactive Login Shell 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 |
| .BIN | Router Firmware File | 4.0 |
| .LOG1 | Windows Registry Hive Log 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 |
| .INF_LOC | Windows Driver Information Cache File | 3.9 |
| .LFS | Samsung Phone params.lfs File | 3.9 |
| .MLC | Microsoft Language Interface Pack | 3.9 |
| .MUI_CCCD5AE0 | Hid User Library | 3.9 |
| .SDB | Application Compatibility Database | 3.9 |
| .C32 | Syslinux COM32 Module | 3.9 |
| .CAB | Windows Cabinet File | 3.9 |
| .DRPM | Delta RPM File | 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 |
| .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 |
| .MTZ | MIUI Theme | 3.8 |
| .TRX_DLL | Windows Startup File | 3.8 |
| .73U | TI-73 Explorer Operating System File | 3.8 |
| .PNF | Precompiled INF File | 3.8 |
| .BASH_PROFILE | Bash Interactive Login Shell File | 3.8 |
| .LIBRARY-MS | Windows Library Description File | 3.8 |
| .HHK | HTML Help Index | 3.8 |
| .WEBPNP | Web Point and Print 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 |
| .DTHUMB | Android Data Thumbnail | 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 |
| .DIAGCAB | Troubleshooting Pack Cabinet File | 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 |
| .PDR | Windows Port Driver | 3.7 |
| .0 | Android CA Digital Certificate | 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 |
| .SBF | Android System File | 3.7 |
| .CANNEDSEARCH | Apple Predefined Search | 3.7 |
| .CPL | Windows Control Panel Item | 3.7 |
| .WDF | Windows Driver Foundation File | 3.7 |
| .BIO | BIOS File | 3.7 |
| .SAVEDSEARCH | Spotlight Saved Search | 3.7 |
| .VXD | Virtual Device Driver | 3.6 |
| .MSP | Windows Installer Patch | 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 |
| .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 |
| .KEXT | Mac OS X Kernel Extension | 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 |
| .IME | Windows Input Method Editor 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 |
| .SWP | Swap File | 3.5 |
| .NTFS | NTFS Partition File | 3.5 |
| .EMERALD | Emerald Theme | 3.5 |
| .LEX | Spelling Dictionary File | 3.5 |
| .PANIC | Kernel Panic File | 3.5 |
| .DFU | iOS DFU File | 3.5 |
| .SHSH | iPhone/iPod Touch SHSH Blob File | 3.5 |
| .4 | Unix Section 4 Manual Page | 3.5 |
| .UTV | SmartCast TV Firmware Update | 3.5 |
| .CPQ | Compaq OEM Disc Configuration File | 3.5 |
| .89U | TI-89 Titanium Operating System File | 3.5 |
| .FFX | Microsoft Find Fast Index | 3.5 |
| .DUB | Windows Spelling Dictionary Identifier | 3.5 |
| .B84 | TI-84 Plus CE Bundle Image | 3.5 |
| .TDZ | Drobo Firmware File | 3.5 |
| .CHG | Windows Net Logon File | 3.5 |
| .JOURNAL | Linux Journald Event Log | 3.5 |
| .SCHEMAS | GConf Schema Definition File | 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 |
| .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 |
| .PROVISIONPROFILE | Apple Provision Profile | 3.3 |
| .STR | Windows Screensaver File | 3.3 |
| .METADATA_NEVER_INDEX | Spotlight Never Index File | 3.3 |
| .IM4P | IMG4 Payload File | 3.3 |
| .CHK | Netgear Router Firmware File | 3.3 |
| .PRINTEREXPORT | Windows Printer Migration File | 3.3 |
| .GROUP | Windows Contacts Group File | 3.3 |
| .DEVICEMETADATA-MS | Device Metadata Package | 3.3 |
| .KDZ | LG Mobile Device Firmware | 3.3 |
| .DIMAX | DiMAX Firmware Image File | 3.3 |
| .KWI | Toyota Entune Update 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 |
| .NBH | ROM Update Utility Image File | 3.3 |
| .FFO | Find Fast Document Properties Cache | 3.3 |
| .MI4 | Audio Player Firmware File | 3.3 |
| .GRP | Windows Program Manager Group | 3.3 |
| .ATAHD | ATA Hard Drive Flag File | 3.3 |
| .CAP | ASUS BIOS Update File | 3.2 |
| .PRT | Printer Driver File | 3.2 |
| .CPI | Codepage Information File | 3.2 |
| .VDEX | Validated Dalvik Executable File | 3.2 |
| .DEV | Windows Device Driver 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 |
| .FLG | Puppy Linux Partition Flag File | 3.1 |
| .KS | Kickstart File | 3.1 |
| .SPL | Windows Print Spool File | 3.1 |
| .THUMBNAILS | Android Thumbnails Folder | 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 |
| .TRASHINFO | Linux Trash Metadata File | 3.0 |
| .ESCOPY | ES File Explorer File Manager Temporary File | 3.0 |
| .EFIRES | EFI Image File | 3.0 |
| .MUN | Windows System Resource Archive | 3.0 |
| .HPJ | Help Project File | 3.0 |
| .TBRES | Microsoft Store TokenBroker Cache File | 3.0 |
| .SEFW | Secure Element Firmware | 3.0 |
| .CHT | Windows Chinese Traditional Noise-Word List File | 3.0 |
| .FTR | IRIX File Type Rules File | 3.0 |
| .CHS | Windows Chinese Noise-Word List File | 3.0 |
| .2 | Unix Section 2 Manual Page | 3.0 |
| .IMG2 | iPhone Firmware Image | 3.0 |
| .RFW | Rockchip Firmware File | 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 |
| .CMO | ASUS BIOS File | 3.0 |
| .WGZ | S60 Web Runtime Widget Package | 3.0 |
| .BOM | Mac OS X Bill of Materials File | 3.0 |
| .SIN | Sony Xperia Firmware File | 3.0 |
| .SCF | Shell Command File | 3.0 |
| .TRASH | ChromeOS Trash Storage | 3.0 |
| .MMV | Magnex Firmware File | 3.0 |
| .ISDATA | Icon Services Data | 3.0 |
| .IFW | INTUS Firmware File | 3.0 |
| .UCE | Windows UCE System File | 3.0 |
| .KC | macOS Kernel Extension Boot File | 3.0 |
| .DIAGPKG | Troubleshooting Pack File | 3.0 |
| .GMMP | WCS Gamut Map Model Profile | 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 |
| .GRL | Windows Update Status File | 2.9 |
| .PS1 | Microsoft Indexing Service Data File | 2.9 |
| .SCAP | EFI Firmware File | 2.9 |
| .PRO | TurboIntegrator Process Definition File | 2.8 |
| .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 |
| .FL1 | Lenovo BIOS Update File | 2.8 |
| .LPD | LPD Daemon Print Permissions File | 2.8 |
| .FFA | Find Fast Status File | 2.8 |
| .MSSTYLE | Windows XP Unsigned Style | 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 |
| .DIAGCFG | Troubleshooting Pack Configuration File | 2.5 |
| .RCO | PlayStation Portable Resource File | 2.5 |
| .PUSH_DEVICEID | Android Device Identification File | 2.5 |
| .QKY | Quirky Kernel | 2.5 |
| .HSH | Windows Catalog Search Index File | 2.5 |
| .7 | Unix Section 7 Manual Page | 2.5 |
| .6 | Unix Section 6 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 |
| .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 |