List of System file extensions

There are many different system file extensions and system file types used with computers, and you'll find an entire list of system file extensions and types on our computer files and file extensions page. It is impossible to remember all file extensions and their associated software programs. Below is the list of system file extensions, broken into categories by sort of files along with the developer and available 100% free online system file tools and apps.

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