System Files

Extension Abbreviation Extension Full name How to open the File Extension
.0 Shared Library Link File How to open .0 file
.0 Indexing Service Data File How to open .0 file
.208 ASUS Notebook BIOS 208 Update File How to open .208 file
.386 Windows Virtual Device Driver How to open .386 file
.2fs Puppy Linux Save State File How to open .2fs file
.3fs Puppy Linux Save State File How to open .3fs file
.73u TI-73 Explorer Operating System File How to open .73u file
.89u TI-89 Titanium Operating System File How to open .89u file
.8cu TI-84 Plus C Operating System File How to open .8cu file
.8xu TI-83 and TI-84 Plus Operating System File How to open .8xu file
.adm Administrative Template File How to open .adm file
.adml Group Policy Language-Specific Administrative Template How to open .adml file
.admx Group Policy Administrative Template File How to open .admx file
.adv Audio Driver File How to open .adv file
.aml ACPI Machine Language File How to open .aml file
.ani Windows Animated Cursor How to open .ani file
.aos ARCHOS PCtablet Firmware File How to open .aos file
.asec Android Secure Application File How to open .asec file
.atahd ATA Hard Drive Flag File How to open .atahd file
.automaticdestinations-ms Windows Jump List File How to open .automaticdestinations-ms file
.bash_history Bash History File How to open .bash_history file
.bash_profile Bash Interactive Login Shell File How to open .bash_profile file
.bashrc Bash Non-Interactive Login Shell File How to open .bashrc file
.bcd Windows Boot Configuration Data File How to open .bcd file
.bio BIOS File How to open .bio file
.bk1 Windows Indexing Service File How to open .bk1 file
.bk2 Windows Indexing Service Data File How to open .bk2 file
.blf CLFS Base Log File How to open .blf file
.bmk Help Bookmarks How to open .bmk file
.bom Mac OS X Bill of Materials File How to open .bom file
.bud Binary Printer Description File How to open .bud file
.c32 Syslinux COM32 Module How to open .c32 file
.cab Windows Cabinet File How to open .cab file
.cannedsearch Apple Predefined Search How to open .cannedsearch file
.cap ASUS BIOS Update File How to open .cap file
.cat Windows Catalog File How to open .cat file
.cdmp WCS Device Model Profile How to open .cdmp file
.ci Windows Content Indexer Catalog File How to open .ci file
.clb COM+ Catalog File How to open .clb file
.cm0012 Configuration Management File How to open .cm0012 file
.cm0013 Samsung Smart TV Index File How to open .cm0013 file
.cmo ASUS BIOS File How to open .cmo file
.cnt Help Contents File How to open .cnt file
.configprofile Apple Configuration Profile How to open .configprofile file
.cpi Codepage Information File How to open .cpi file
.cpl Windows Control Panel Item How to open .cpl file
.cpq Compaq OEM Disc Configuration File How to open .cpq file
.cpr Windows Phone Display Settings File How to open .cpr file
.crash Mac OS X Crash Log File How to open .crash file
.cur Windows Cursor How to open .cur file
.customdestinations-ms Windows Jump List File How to open .customdestinations-ms file
.dat Windows Registry Hive File How to open .dat file
.desklink Desktop Shortcut How to open .desklink file
.deskthemepack Windows 8 Desktop Theme Pack File How to open .deskthemepack file
.devicemetadata-ms Device Metadata Package How to open .devicemetadata-ms file
.dfu iOS DFU File How to open .dfu file
.diagcab Troubleshooting Pack Cabinet File How to open .diagcab file
.diagcfg Troubleshooting Pack Configuration File How to open .diagcfg file
.diagpkg Troubleshooting Pack File How to open .diagpkg file
.diffbase Windows Diagnostics Tracking Diffbase File How to open .diffbase file
.dimax DiMAX Firmware Image File How to open .dimax file
.dit Active Directory Information Tree File How to open .dit file
.dll Dynamic Link Library How to open .dll file
.dlx Renamed DLL File How to open .dlx file
.dmp Windows Memory Dump How to open .dmp file
.dock Mac OS X Dock Extra How to open .dock file
.drpm Delta RPM File How to open .drpm file
.drv Device Driver How to open .drv file
.dthumb Android Data Thumbnail How to open .dthumb file
.dub Windows Spelling Dictionary Identifier How to open .dub file
.dvd DOS Device Driver How to open .dvd file
.dyc Xerox Printer Driver Configuration File How to open .dyc file
.ebd Windows EBD System File How to open .ebd file
.edj Enlightenment Theme File How to open .edj file
.efi Extensible Firmware Interface File How to open .efi file
.efires EFI Image File How to open .efires file
.elf Executable and Linkable Format File How to open .elf file
.emerald Emerald Theme How to open .emerald file
.escopy ES File Explorer File Manager Temporary File How to open .escopy file
.etl Microsoft Event Trace Log File How to open .etl file
.evt Windows Event Viewer Log File How to open .evt file
.evtx Windows 7 Event Log File How to open .evtx file
.ffa Find Fast Status File How to open .ffa file
.ffl Find Fast Document List How to open .ffl file
.ffo Find Fast Document Properties Cache How to open .ffo file
.ffx Microsoft Find Fast Index How to open .ffx file
.fid Microsoft Catalog Indexing Service File How to open .fid file
.firm Boot9Strap 3DS Firmware File How to open .firm file
.fl1 Lenovo BIOS Update File How to open .fl1 file
.flg Puppy Linux Partition Flag File How to open .flg file
.fota Firmware Over-the-Air File How to open .fota file
.fpbf Mac OS X Burn Folder How to open .fpbf file
.ftf FlashTool Firmware File How to open .ftf file
.ftg Full Text Group How to open .ftg file
.fts Full Text Search How to open .fts file
.fx ReadyBoot Trace File How to open .fx file
.gmmp WCS Gamut Map Model Profile How to open .gmmp file
.grl Windows Update Status File How to open .grl file
.group Windows Contacts Group File How to open .group file
.grp Windows Program Manager Group How to open .grp file
.h1s Windows Assistance Platform Help File How to open .h1s file
.hcd Samsung Android Firmware File How to open .hcd file
.hdmp Windows Heap Dump How to open .hdmp file
.help Mac OS X Help Book How to open .help file
.hhc HTML Help Table of Contents How to open .hhc file
.hhk HTML Help Index How to open .hhk file
.hiv Windows Registry Hive File How to open .hiv file
.hlp Windows Help File How to open .hlp file
.hpj Help Project File How to open .hpj file
.hsh Windows Catalog Search Index File How to open .hsh file
.htt Hypertext Template File How to open .htt file
.hve Windows Registry Hive File How to open .hve file
.chg Windows Net Logon File How to open .chg file
.chk Netgear Router Firmware File How to open .chk file
.chs Windows Chinese Noise-Word List File How to open .chs file
.cht Windows Chinese Traditional Noise-Word List File How to open .cht file
.icl Windows Icon Library File How to open .icl file
.icns macOS Icon Resource File How to open .icns file
.ico Icon File How to open .ico file
.iconpackage IconPackager Theme File How to open .iconpackage file
.idi EVA Controller Event Log How to open .idi file
.ifw INTUS Firmware File How to open .ifw file
.im4p IMG4 Payload File How to open .im4p file
.ime Windows Input Method Editor File How to open .ime file
.img3 iPhone IMG3 File How to open .img3 file
.inf_loc Windows Driver Information Cache File How to open .inf_loc file
.ins Internet Naming Service File How to open .ins file
.internetconnect Apple Internet Connect Document How to open .internetconnect file
.ion File Description File How to open .ion file
.ioplist Mac OS X IOPLIST File How to open .ioplist file
.ipod Rockbox Firmware File How to open .ipod file
.iptheme IconPackager Raw Theme File How to open .iptheme file
.itemdata-ms Windows 8 Start Screen Item Data File How to open .itemdata-ms file
.its Internet Document Set How to open .its file
.ius InfoTMIC Firmware Update File How to open .ius file
.job Windows Task Scheduler Job File How to open .job file
.jpn Windows Japanese Noise-Word List File How to open .jpn file
.kdz LG Mobile Device Firmware How to open .kdz file
.kext Mac OS X Kernel Extension How to open .kext file
.ko Linux Kernel Module File How to open .ko file
.kor Windows Korean Noise-Words List File How to open .kor file
.ks Kickstart File How to open .ks file
.manifest Windows Application Manifest File How to open .manifest file
.mapimail Send To Mail Recipient How to open .mapimail file
.mbn Multi Boot Image How to open .mbn file
.mbr Master Boot Record File How to open .mbr file
.mdmp Windows Minidump How to open .mdmp file
.me Puppy Linux Partition Flag File How to open .me file
.mem Parallels Desktop Memory Dump File How to open .mem file
.menu macOS Menu Extra How to open .menu file
.metadata_never_index Spotlight Never Index File How to open .metadata_never_index file
.mi4 Audio Player Firmware File How to open .mi4 file
.mlc Microsoft Language Interface Pack How to open .mlc file
.mmv Magnex Firmware File How to open .mmv file
.mobileconfig Apple Mobile Configuration File How to open .mobileconfig file
.mod GRUB Module How to open .mod file
.msc Microsoft Management Console Snap-in Control File How to open .msc file
.msp Windows Installer Patch How to open .msp file
.msstyle Windows XP Unsigned Style How to open .msstyle file
.msstyles Windows XP Style How to open .msstyles file
.mtz MIUI Theme How to open .mtz file
.mui Multilingual User Interface File How to open .mui file
.mui_cccd5ae0 Hid User Library How to open .mui_cccd5ae0 file
.mum Windows Vista Update Package How to open .mum file
.mun Windows System Resource Archive How to open .mun file
.mydocs Send To My Documents How to open .mydocs file
.nb0 Device Boot Loader Image How to open .nb0 file
.nbh ROM Update Utility Image File How to open .nbh file
.networkconnect Apple Network Connect Document How to open .networkconnect file
.nfo System Information File How to open .nfo file
.nls Microsoft National Language Support File How to open .nls file
.nlt Windows Transliteration File How to open .nlt file
.nt Windows NT Startup File How to open .nt file
.ntfs NTFS Partition File How to open .ntfs file
.odex Optimized Dalvik Executable How to open .odex file
.panic Kernel Panic File How to open .panic file
.pat DiskStation Manager Installation File How to open .pat file
.pck System Center Configuration Manager Package File How to open .pck file
.pdr Windows Port Driver How to open .pdr file
.pfx PKCS #12 Certificate File How to open .pfx file
.pid Creative Driver File How to open .pid file
.pit Samsung Phone Firmware File How to open .pit file
.pk2 Silkroad Online Game Data File How to open .pk2 file
.plasmoid Plasma Widget How to open .plasmoid file
.pnf Precompiled INF File How to open .pnf file
.pol Windows Policy File How to open .pol file
.ppd PostScript Printer Description File How to open .ppd file
.prefpane Mac OS X System Preference Pane How to open .prefpane file
.printerexport Windows Printer Migration File How to open .printerexport file
.pro TurboIntegrator Process Definition File How to open .pro file
.profile Bash Shell Profile How to open .profile file
.prop Android Build Properties File How to open .prop file
.provisionprofile Apple Provision Profile How to open .provisionprofile file
.ps1 Microsoft Indexing Service Data File How to open .ps1 file
.ps2 Microsoft Search Catalog Index File How to open .ps2 file
.pwl Windows Password List How to open .pwl file
.qky Quirky Kernel How to open .qky file
.qvm Q Virtual Machine How to open .qvm file
.rc1 Samsung Mobile Device Firmware File How to open .rc1 file
.rc2 Samsung Mobile Device Firmware File How to open .rc2 file
.rco PlayStation Portable Resource File How to open .rco file
.reg Registry File How to open .reg file
.reglnk Registry Editor Shortcut File How to open .reglnk file
.regtrans-ms Registry Transaction Log File How to open .regtrans-ms file
.rfw Rockchip Firmware File How to open .rfw file
.rmt Router Firmware File How to open .rmt file
.rs Windows Rating System File How to open .rs file
.ruf Samsung DVD and Blu-ray Player Firmware File How to open .ruf file
.rvp Sharp Blu-ray Player Firmware File How to open .rvp file
.savedsearch Spotlight Saved Search How to open .savedsearch file
.saver Mac OS X Screen Saver How to open .saver file
.sb Slax Bundle How to open .sb file
.sbf Android System File How to open .sbf file
.sbn Cisco IP Phone Firmware File How to open .sbn file
.scap EFI Firmware File How to open .scap file
.scf Windows Explorer Command How to open .scf file
.scr Windows Screensaver How to open .scr file
.sdb Custom Application Compatibility Database How to open .sdb file
.sdt Siemens Desktop Theme File How to open .sdt file
.searchconnector-ms Windows Search Connector File How to open .searchconnector-ms file
.service Systemd Service Unit File How to open .service file
.sfcache ReadyBoost Cache File How to open .sfcache file
.shd Windows Print Job Shadow File How to open .shd file
.shsh iPhone/iPod Touch SHSH Blob File How to open .shsh file
.schemas GConf Schema Definition File How to open .schemas file
.sin Sony Xperia Firmware File How to open .sin file
.so.0 Unix Shared Library File How to open .so.0 file
.spl Windows Print Spool File How to open .spl file
.spx System Profiler XML Report How to open .spx file
.sqm Service Quality Monitoring File How to open .sqm file
.sys Windows System File How to open .sys file
.sys Motorola Driver File How to open .sys file
.ta Sony Firmware File How to open .ta file
.tco2 TI-Nspire CX II Operating System File How to open .tco2 file
.tdz Drobo Firmware File How to open .tdz file
.tha Windows Thai Noise-Words List File How to open .tha file
.theme Microsoft Plus! Desktop Theme How to open .theme file
.thumbnails Android Thumbnails Folder How to open .thumbnails file
.timer Systemd Unit Configuration File How to open .timer file
.trashes macOS USB Flash Drive Trash Folder How to open .trashes file
.trashinfo Linux Trash Metadata File How to open .trashinfo file
.trx_dll Windows Startup File How to open .trx_dll file
.uce Windows UCE System File How to open .uce file
.vdex Validated Dalvik Executable File How to open .vdex file
.vga VGA Display Driver How to open .vga file
.vgd Generic CADD VGA Driver How to open .vgd file
.vx_ Compressed Virtual Device Driver File How to open .vx_ file
.vxd Virtual Device Driver How to open .vxd file
.wdf Windows Driver Foundation File How to open .wdf file
.wdgt Dashboard Widget How to open .wdgt file
.webpnp Web Point and Print File How to open .webpnp file
.wer Windows Error Report How to open .wer file
.wgz S60 Web Runtime Widget Package How to open .wgz file
.wlu Windows Legacy Update How to open .wlu file
.wph Phoenix BIOS File How to open .wph file
.wpx Printer Description File How to open .wpx file
.xfb Xserve RAID Firmware Binary File How to open .xfb file
.xrm-ms Microsoft Security Certificate How to open .xrm-ms file
.zone.identifier Windows Zone Identifier File How to open .zone.identifier file