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