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 |
|---|---|---|
| .AML | ACPI Machine Language File | 4.5 |
| .WDGT | Dashboard Widget | 4.4 |
| .REG | Registry File | 4.4 |
| .ADMX | Group Policy Administrative Template File | 4.4 |
| .CUR | Windows Cursor | 4.3 |
| .REGTRANS-MS | Registry Transaction Log File | 4.3 |
| .FTF | FlashTool Firmware File | 4.3 |
| .CLB | COM+ Catalog File | 4.3 |
| .ICONPACKAGE | IconPackager Theme File | 4.3 |
| .ICNS | macOS Icon Resource File | 4.3 |
| .ANI | Windows Animated Cursor | 4.3 |
| .DLL | Dynamic Link Library | 4.3 |
| .DESKTHEMEPACK | Windows 8 Desktop Theme Pack File | 4.3 |
| .SEARCHCONNECTOR-MS | Windows Search Connector File | 4.2 |
| .EBD | Windows EBD System File | 4.2 |
| .HTT | Hypertext Template File | 4.2 |
| .73U | TI-73 Explorer Operating System File | 4.2 |
| .DESKLINK | Desktop Shortcut | 4.2 |
| .THEME | Microsoft Plus! Desktop Theme | 4.2 |
| .LNK | Windows Shortcut | 4.2 |
| .VGA | VGA Display Driver | 4.2 |
| .VX_ | Compressed Virtual Device Driver File | 4.2 |
| .ITEMDATA-MS | Windows 8 Start Screen Item Data File | 4.2 |
| .HVE | Windows Registry Hive File | 4.2 |
| .DMP | Windows Memory Dump | 4.2 |
| .NFO | System Information File | 4.2 |
| .DVD | DOS Device Driver | 4.2 |
| .MDMP | Windows Minidump | 4.2 |
| .PK2 | Silkroad Online Game Data File | 4.2 |
| .PCK | System Center Configuration Manager Package File | 4.2 |
| .RMT | Router Firmware File | 4.2 |
| .QVM | Q Virtual Machine | 4.2 |
| .ICO | Icon File | 4.1 |
| .NT | Windows NT Startup File | 4.1 |
| .INF_LOC | Windows Driver Information Cache File | 4.1 |
| .SYS | Windows System File | 4.1 |
| .CPL | Windows Control Panel Item | 4.1 |
| .LIBRARY-MS | Windows Library Description File | 4.1 |
| .SCR | Windows Screensaver | 4.1 |
| .HIV | Windows Registry Hive File | 4.1 |
| .ASEC | Android Secure Application File | 4.1 |
| .SFCACHE | ReadyBoost Cache File | 4.1 |
| .RC1 | Samsung Mobile Device Firmware File | 4.1 |
| .MANIFEST | Windows Application Manifest File | 4.1 |
| .PROP | Android Build Properties File | 4.1 |
| .PAT | DiskStation Manager Installation File | 4.1 |
| .BASH_HISTORY | Bash History File | 4.0 |
| .ION | File Description File | 4.0 |
| .BIN | Router Firmware File | 4.0 |
| .CAB | Windows Cabinet File | 4.0 |
| .000 | Indexing Service Data File | 4.0 |
| .EDJ | Enlightenment Theme File | 4.0 |
| .TIMER | Systemd Unit Configuration File | 4.0 |
| .LOCKFILE | Mac OS X PLIST Lock File | 4.0 |
| .H1S | Windows Assistance Platform Help File | 4.0 |
| .ETL | Microsoft Event Trace Log File | 4.0 |
| .LOG1 | Windows Registry Hive Log File | 4.0 |
| .FFX | Microsoft Find Fast Index | 4.0 |
| .ZONE.IDENTIFIER | Windows Zone Identifier File | 4.0 |
| .MENU | macOS Menu Extra | 4.0 |
| .NLT | Windows Transliteration File | 4.0 |
| .SERVICE | Systemd Service Unit File | 4.0 |
| .PWL | Windows Password List | 4.0 |
| .CGZ | Linux Drivers Archive | 4.0 |
| .FOTA | Firmware Over-the-Air File | 4.0 |
| .ELF | Executable and Linkable Format File | 4.0 |
| .MAPIMAIL | Send To Mail Recipient | 4.0 |
| .PREFPANE | Mac OS X System Preference Pane | 4.0 |
| .CI | Windows Content Indexer Catalog File | 4.0 |
| .MUI | Multilingual User Interface File | 4.0 |
| .DAT | Windows Registry Hive File | 4.0 |
| .MSC | Microsoft Management Console Snap-in Control File | 4.0 |
| .ADM | Administrative Template File | 4.0 |
| .SDB | Custom Application Compatibility Database | 3.9 |
| .FIRM | Boot9Strap 3DS Firmware File | 3.9 |
| .FX | ReadyBoot Trace File | 3.9 |
| .WDF | Windows Driver Foundation File | 3.9 |
| .MLC | Microsoft Language Interface Pack | 3.9 |
| .LFS | Samsung Phone params.lfs File | 3.9 |
| .CM0013 | Samsung Smart TV Index File | 3.9 |
| .BASH_PROFILE | Bash Interactive Login Shell File | 3.9 |
| .MOD | GRUB Module | 3.9 |
| .MSSTYLES | Windows XP Style | 3.9 |
| .MTZ | MIUI Theme | 3.9 |
| .MOBILECONFIG | Apple Mobile Configuration File | 3.9 |
| .PNF | Precompiled INF File | 3.8 |
| .SYS | Motorola Driver File | 3.8 |
| .PIT | Samsung Phone Firmware File | 3.8 |
| .MBR | Master Boot Record File | 3.8 |
| .DRV | Device Driver | 3.8 |
| .C32 | Syslinux COM32 Module | 3.8 |
| .HHK | HTML Help Index | 3.8 |
| .POL | Windows Policy File | 3.8 |
| .GROUP | Windows Contacts Group File | 3.8 |
| .WEBPNP | Web Point and Print File | 3.8 |
| .EFI | Extensible Firmware Interface File | 3.8 |
| .208 | ASUS Notebook BIOS 208 Update File | 3.8 |
| .MSP | Windows Installer Patch | 3.8 |
| .0 | Shared Library Link File | 3.8 |
| .DIAGCAB | Troubleshooting Pack Cabinet File | 3.8 |
| .BCD | Windows Boot Configuration Data File | 3.8 |
| .BIO | BIOS File | 3.8 |
| .BASHRC | Bash Non-Interactive Login Shell File | 3.8 |
| .INS | Internet Naming Service File | 3.8 |
| .IMG3 | iPhone IMG3 File | 3.8 |
| .3FS | Puppy Linux Save State File | 3.8 |
| .PDR | Windows Port Driver | 3.8 |
| .DTHUMB | Android Data Thumbnail | 3.7 |
| .DRPM | Delta RPM File | 3.7 |
| .AOS | ARCHOS PCtablet Firmware File | 3.7 |
| .SDT | Siemens Desktop Theme File | 3.7 |
| .CANNEDSEARCH | Apple Predefined Search | 3.7 |
| .CHS | Windows Chinese Noise-Word List File | 3.7 |
| .SAVEDSEARCH | Spotlight Saved Search | 3.7 |
| .IOPLIST | Mac OS X IOPLIST File | 3.7 |
| .CNT | Help Contents File | 3.7 |
| .VXD | Virtual Device Driver | 3.6 |
| .NLS | Microsoft National Language Support File | 3.6 |
| .JOB | Windows Task Scheduler Job File | 3.6 |
| .PPD | PostScript Printer Description File | 3.6 |
| .DIT | Active Directory Information Tree File | 3.6 |
| .SBF | Android System File | 3.6 |
| .HDMP | Windows Heap Dump | 3.6 |
| .WPX | Printer Description File | 3.6 |
| .CRASH | Mac OS X Crash Log File | 3.6 |
| .KEY | Security Key | 3.6 |
| .LOG2 | Windows Registry Hive Log 2 File | 3.6 |
| .DEV | Windows Device Driver File | 3.6 |
| .BOM | Mac OS X Bill of Materials File | 3.6 |
| .FPBF | Mac OS X Burn Folder | 3.6 |
| .CAT | Windows Catalog File | 3.6 |
| .MUI_CCCD5AE0 | Hid User Library | 3.6 |
| .PROFILE | Bash Shell Profile | 3.6 |
| .LST | GRUB Boot List File | 3.6 |
| .NB0 | Device Boot Loader Image | 3.6 |
| .PRF | Windows System File | 3.6 |
| .8XU | TI-83 and TI-84 Plus Operating System File | 3.6 |
| .SHD | Windows Print Job Shadow File | 3.6 |
| .HLP | Windows Help File | 3.6 |
| .ADML | Group Policy Language-Specific Administrative Template | 3.6 |
| .MBN | Multi Boot Image | 3.5 |
| .SCHEMAS | GConf Schema Definition File | 3.5 |
| .CHG | Windows Net Logon File | 3.5 |
| .GRP | Windows Program Manager Group | 3.5 |
| .SQM | Service Quality Monitoring File | 3.5 |
| .PANIC | Kernel Panic File | 3.5 |
| .IDX | Index File | 3.5 |
| .TDZ | Drobo Firmware File | 3.5 |
| .SWP | Swap File | 3.5 |
| .SHSH | iPhone/iPod Touch SHSH Blob File | 3.5 |
| .KS | Kickstart File | 3.5 |
| .CPQ | Compaq OEM Disc Configuration File | 3.5 |
| .SBN | Cisco IP Phone Firmware File | 3.5 |
| .IME | Windows Input Method Editor File | 3.5 |
| .386 | Windows Virtual Device Driver | 3.5 |
| .2FS | Puppy Linux Save State File | 3.5 |
| .HCD | Samsung Android Firmware File | 3.4 |
| .PS2 | Microsoft Search Catalog Index File | 3.4 |
| .HHC | HTML Help Table of Contents | 3.4 |
| .FLG | Puppy Linux Partition Flag File | 3.4 |
| .ODEX | Optimized Dalvik Executable | 3.4 |
| .WER | Windows Error Report | 3.4 |
| .ADV | Audio Driver File | 3.4 |
| .KO | Linux Kernel Module File | 3.4 |
| .DFU | iOS DFU File | 3.4 |
| .IM4P | IMG4 Payload File | 3.3 |
| .PRINTEREXPORT | Windows Printer Migration File | 3.3 |
| .8CU | TI-84 Plus C Operating System File | 3.3 |
| .PRO | TurboIntegrator Process Definition File | 3.3 |
| .THA | Windows Thai Noise-Words List File | 3.3 |
| .ICL | Windows Icon Library File | 3.3 |
| .DIMAX | DiMAX Firmware Image File | 3.3 |
| .CPI | Codepage Information File | 3.3 |
| .CHK | Netgear Router Firmware File | 3.3 |
| .PFX | PKCS #12 Certificate File | 3.3 |
| .NTFS | NTFS Partition File | 3.3 |
| .KEXT | Mac OS X Kernel Extension | 3.3 |
| .CHT | Windows Chinese Traditional Noise-Word List File | 3.3 |
| .BMK | Help Bookmarks | 3.3 |
| .METADATA_NEVER_INDEX | Spotlight Never Index File | 3.3 |
| .BLF | CLFS Base Log File | 3.3 |
| .MI4 | Audio Player Firmware File | 3.3 |
| .ATAHD | ATA Hard Drive Flag File | 3.3 |
| .TRX_DLL | Windows Startup File | 3.3 |
| .MSSTYLE | Windows XP Unsigned Style | 3.3 |
| .NBH | ROM Update Utility Image File | 3.3 |
| .PRT | Printer Driver File | 3.2 |
| .PID | Creative Driver File | 3.2 |
| .STR | Windows Screensaver File | 3.2 |
| .SAVER | Mac OS X Screen Saver | 3.2 |
| .CUSTOMDESTINATIONS-MS | Windows Jump List File | 3.2 |
| .THUMBNAILS | Android Thumbnails Folder | 3.2 |
| .BK2 | Windows Indexing Service Data File | 3.2 |
| .CONFIGPROFILE | Apple Configuration Profile | 3.1 |
| .SO.0 | Unix Shared Library File | 3.1 |
| .SPL | Windows Print Spool File | 3.1 |
| .XRM-MS | Microsoft Security Certificate | 3.1 |
| .RUF | Samsung DVD and Blu-ray Player Firmware File | 3.1 |
| .MUM | Windows Vista Update Package | 3.1 |
| .CAP | ASUS BIOS Update File | 3.1 |
| .CPR | Windows Phone Display Settings File | 3.1 |
| .PS1 | Microsoft Indexing Service Data File | 3.1 |
| .XFB | Xserve RAID Firmware Binary File | 3.0 |
| .CMO | ASUS BIOS File | 3.0 |
| .DLX | Renamed DLL File | 3.0 |
| .BK1 | Windows Indexing Service File | 3.0 |
| .HSH | Windows Catalog Search Index File | 3.0 |
| .ME | Puppy Linux Partition Flag File | 3.0 |
| .UCE | Windows UCE System File | 3.0 |
| .SIN | Sony Xperia Firmware File | 3.0 |
| .SHSH2 | iOS SHSH Blob | 3.0 |
| .TA | Sony Firmware File | 3.0 |
| .PROVISIONPROFILE | Apple Provision Profile | 3.0 |
| .B83 | TI-83 Premium CE Bundle Image | 3.0 |
| .B84 | TI-84 Plus CE Bundle Image | 3.0 |
| .KWI | Toyota Entune Update File | 3.0 |
| .MUN | Windows System Resource Archive | 3.0 |
| .MEM | Parallels Desktop Memory Dump File | 3.0 |
| .KDZ | LG Mobile Device Firmware | 3.0 |
| .CM0012 | Configuration Management File | 3.0 |
| .ESCOPY | ES File Explorer File Manager Temporary File | 3.0 |
| .IFW | INTUS Firmware File | 3.0 |
| .GMMP | WCS Gamut Map Model Profile | 3.0 |
| .DIAGPKG | Troubleshooting Pack File | 3.0 |
| .LPD | LPD Daemon Print Permissions File | 3.0 |
| .EFIRES | EFI Image File | 3.0 |
| .0 | Android CA Digital Certificate | 3.0 |
| .RFW | Rockchip Firmware File | 3.0 |
| .HPJ | Help Project File | 3.0 |
| .DIC | Windows 10 Custom Spelling Dictionary | 3.0 |
| .EVTX | Windows 7 Event Log File | 2.9 |
| .GRL | Windows Update Status File | 2.9 |
| .SCF | Windows Explorer Command | 2.9 |
| .FL1 | Lenovo BIOS Update File | 2.8 |
| .FFA | Find Fast Status File | 2.8 |
| .DEVICEMETADATA-MS | Device Metadata Package | 2.8 |
| .DYC | Xerox Printer Driver Configuration File | 2.8 |
| .KBD | Keyboard Layout Script | 2.8 |
| .PPM | Post Programmable Memory File | 2.7 |
| .FFO | Find Fast Document Properties Cache | 2.7 |
| .AUTOMATICDESTINATIONS-MS | Windows Jump List File | 2.7 |
| .RC2 | Samsung Mobile Device Firmware File | 2.7 |
| .DSS | DCC Active Designer File | 2.6 |
| .IDI | EVA Controller Event Log | 2.6 |
| .SB | Slax Bundle | 2.6 |
| .VGD | Generic CADD VGA Driver | 2.6 |
| .BUD | Binary Printer Description File | 2.6 |
| .TRASHES | macOS USB Flash Drive Trash Folder | 2.6 |
| .LOCALIZED | macOS Directory Localization File | 2.5 |
| .MYDOCS | Send To My Documents | 2.5 |
| .NETWORKCONNECT | Apple Network Connect Document | 2.5 |
| .SCAP | EFI Firmware File | 2.5 |
| .WPH | Phoenix BIOS File | 2.5 |
| .IPOD | Rockbox Firmware File | 2.5 |
| .LPD | Lookout Protocol Driver File | 2.5 |
| .RCO | PlayStation Portable Resource File | 2.5 |
| .FTS | Full Text Search | 2.5 |
| .IPTHEME | IconPackager Raw Theme File | 2.5 |
| .PLASMOID | Plasma Widget | 2.5 |
| .QKY | Quirky Kernel | 2.4 |
| .RS | Windows Rating System File | 2.4 |
| .JPN | Windows Japanese Noise-Word List File | 2.4 |
| .WGZ | S60 Web Runtime Widget Package | 2.3 |
| .FID | Microsoft Catalog Indexing Service File | 2.3 |
| .SPX | System Profiler XML Report | 2.3 |
| .DUB | Windows Spelling Dictionary Identifier | 2.0 |
| .LM | Language Model File | 2.0 |
| .EVT | Windows Event Viewer Log File | 2.0 |
| .VDEX | Validated Dalvik Executable File | 2.0 |
| .89U | TI-89 Titanium Operating System File | 2.0 |
| .LEX | Spelling Dictionary File | 2.0 |
| .IUS | InfoTMIC Firmware Update File | 2.0 |
| .RCV | BIOS Recovery File | 2.0 |
| .KOR | Windows Korean Noise-Words List File | 2.0 |
| .DIAGCFG | Troubleshooting Pack Configuration File | 2.0 |
| .TCO2 | TI-Nspire CX II Operating System File | 2.0 |
| .REGLNK | Registry Editor Shortcut File | 2.0 |
| .FFL | Find Fast Document List | 2.0 |
| .CDMP | WCS Device Model Profile | 2.0 |
| .EMERALD | Emerald Theme | 2.0 |
| .FTG | Full Text Group | 2.0 |
| .MMV | Magnex Firmware File | 2.0 |
| .DOCK | Mac OS X Dock Extra | 2.0 |
| .TRASHINFO | Linux Trash Metadata File | 2.0 |
| .WLU | Windows Legacy Update | 2.0 |
| .ANN | Help Annotations | 1.8 |
| .HELP | Mac OS X Help Book | 1.6 |
| .DIFFBASE | Windows Diagnostics Tracking Diffbase File | 1.5 |
| .OZIP | OPPO Smartphone Firmware Update | 1.5 |
| .INTERNETCONNECT | Apple Internet Connect Document | 1.3 |
| .ITS | Internet Document Set | 1.0 |
| .RVP | Sharp Blu-ray Player Firmware File | 1.0 |