Browse file extensions by file type category:

System file icon System file type extensions
(481 file extension database entries)

File extensions used for computer operating systems internal use and which are required for proper and healthy functionality of any operating system

List of common system file types

System file extension list

File extensions used for computer operating systems internal use and which are required for proper and healthy functionality of any operating system.

System files are very important group of file formats, which are used by computer operating systems. If any of these files are missing or corrupted, the operating system usually doesn't work correctly or doesn't start at all. Many system files have their file attribute set to hidden, so they aren't visible to users, as a preventive measures . Basic system files are incompatible between various operating systems and each operating system has its own native binary formats for them. For example Microsoft Windows system files could never work as system files for Linux or MAC OS X.
Device drives are a bit of exception. Microsoft Windows device drivers are still not compatible with Linux or MAC OS X, but the same driver could possibly be used in different versions of Microsoft Windows, e.g. Windows 95/98/Me have the same driver file format, and often drivers for Windows 95 could work in the newer Windows Me.

Most widely used system file extensions are sys, drv, dll, inf etc..

More experienced users can configure Windows Explorer or file manager to show hidden and system files. But be very careful, any damage to important system files can lead to malfunction or an unstable operating system.

Sort by: ExtensionSort by: File type description
dll file icon file extension dllDynamic Link Library
 file extension datProgram data
ds_store file icon file extension ds_storemacOS folder information
 file extension sysSystem file
etl file icon file extension etlMicrosoft Windows trace log
h1s file icon file extension h1sMicrosoft Windows Assistance Platform client help document
shs file icon file extension shsMicrosoft Windows 95/98 clipboard data
 file extension soELF shared library
scr file icon file extension scrMS Windows screensaver
 file extension efiExtensible Firmware Interface
sfcache file icon file extension sfcacheReadyBoost cache
 file extension romRead Only Memory image
 file extension 0Linux shared library link
mui file icon file extension muiMultiLanguage Windows resource data
 file extension patSynology DiskStation DSM update
 file extension rioIBM AIX system data
pf file icon file extension pfMicrosoft Windows prefetch data
 file extension dumpDump data
 file extension idxIndex file
 file extension bziDarik's Boot And Nuke kernel data file
ocx file icon file extension ocxActiveX Control
cat file icon file extension catMicrosoft Security Catalog
pcf file icon file extension pcfMicrosoft Source Profiler profiler command
reg file icon file extension regWindows registry data
evtx file icon file extension evtxMicrosoft Windows event log
inf file icon file extension infWindows installation script
regtrans-ms file icon file extension regtrans-msMicrosoft Windows registry changes temporary data
gadget file icon file extension gadgetWindows sidebar gadget
 file extension shaUnix SHAR archive
key file icon file extension keyMicrosoft Windows 7 registry key file
man file icon file extension manMicrosoft Windows 2000/XP mandatory user profile
drv file icon file extension drvMicrosoft Windows device driver
 file extension lockLock data
blf file icon file extension blfMicrosoft Windows registry data file
 file extension sfsSquashfs file archive
_ipod_control file icon file extension _ipod_controliPod control data file
payload file icon file extension payloadMicrosoft Windows Mobile data
 file extension apdiskApple macOS disk information data
job file icon file extension jobMicrosoft Windows Task Scheduler task object
rtp file icon file extension rtpSoftware update
 file extension sccVisual SourceSafe control data
 file extension ddzAdaptec SCO Unix driver image
 file extension scexeHP iL02 firmware update
 file extension x86Microsoft Office dynamic link library
dev file icon file extension devWindows device driver
spl file icon file extension splMicrosoft Windows printing spool
mdmp file icon file extension mdmpMicrosoft Windows minidump
 file extension markerMicrosoft Windows 10 system data
cdfs file icon file extension cdfsCompact Disc File System
 file extension pbdPowerBuilder dynamic link library
 file extension aixIBM AIX data
nib file icon file extension nibInterface Builder user interface resources
 file extension mofSystems Management Server managed object format
 file extension swpSwap file
ovl file icon file extension ovlOverlay file
 file extension 212ASUS BIOS update
 file extension 211ASUS BIOS update file
sif file icon file extension sifMicrosoft Windows NT setup installation data
grp file icon file extension grpMicrosoft Windows program group
 file extension locationMicrosoft Windows 10 registry data
mum file icon file extension mumMicrosoft Windows Update Package
 file extension mpkgMeta package
 file extension appledoubleApple AppleDouble resource data
 file extension krmKenwood firmware data
cpl file icon file extension cplMicrosoft Windows Control Panel data
 file extension acctIBM AIX system data
 file extension adupsGoogle Android data
strings file icon file extension stringsApple Mac strings
 file extension pidUnix process ID
sfc file icon file extension sfcMicrosoft Windows system file check data
 file extension nxpAdaOS profiling information for one execution file
 file extension tlbOLE type library
 file extension scFramework II display driver
gpd file icon file extension gpdMicrosoft Windows universal printer unidrv minidriver
vxd file icon file extension vxdMicrosoft Windows virtual device driver
 file extension uxzIBM Flex CMM update data
 file extension ecdCoCut Plotter printer driver
 file extension bioOS/2 BIOS file
wdf file icon file extension wdfMicrosoft Windows Driver Foundation data
msc file icon file extension mscMicrosoft management console control data
 file extension cddChromeleon device driver
 file extension bifBoot information file
 file extension oviPC-9801 FM system data
 file extension qdzStratix V device driver
 file extension ext4Fourth extended filesystem
 file extension bomApple Mac OS X Bill of Materials
 file extension motLinux load instructions
 file extension h86CP/M data
dt file icon file extension dtMacintosh file data fork
 file extension im4pApple iOS IMG4 payload data
service file icon file extension servicemacOS (OS X) service application data
 file extension identifierMicrosoft Windows zone identifier data
 file extension alxBlackBerry application loader
 file extension koLinux kernel module
wss file icon file extension wssMicrosoft Windows Sound System
 file extension lanNovell NetWare LAN driver
nls file icon file extension nlsMicrosoft National Language Support data
localized file icon file extension localizedmacOS (OS X) system localization
 file extension bcdMicrosoft Windows boot configuration
 file extension 100Award BIOS Upgrade File version 1.0
 file extension crmlogMicrosoft Windows CRM log
h1c file icon file extension h1cWindows Vista file related to Assistance Platform (AP) help
lgs file icon file extension lgsMicrosoft Windows application log
 file extension relNintendo Wii relocatable module
 file extension ospCrystal Semiconductor driver data
hlp file icon file extension hlpHelp file
 file extension cbMicrosoft clean boot data
shd file icon file extension shdMicrosoft Windows shadow spooler file
ami file icon file extension amiAMI BIOS firmware data
 file extension kbdKeyboard script file layout
 file extension arLinux/Unix command library
 file extension mftMicrosoft Windows NTFS master file table
hiv file icon file extension hivWindows NT registry hive
rsrc file icon file extension rsrcMAC OS resource data
psf file icon file extension psfWindows Server Update Services patch storage file
 file extension dioiPaq 914c flash data
gid file icon file extension gidMicrosoft Windows Help general index
rx file icon file extension rxMS-DOS 7 data
hv file icon file extension hvMicrosoft Windows Mobile hive
 file extension nxsAdaOS support module
 file extension bnrNintento Wii homebrew data
folder file icon file extension folderMicrosoft Windows Explorer folder data
lbr file icon file extension lbrLotus 1-2-3 display driver data
 file extension accessJava access control data
osc file icon file extension oscRemote Installation Services client installation wizard
 file extension ddpOS/2 device driver profile
vdx file icon file extension vdxWindows 32-bit system driver
ann file icon file extension annMicrosoft Windows Help annotation
 file extension mqMicrosoft Windows message data
fseventsd file icon file extension fseventsdmacOS (OS X) data
 file extension 3_dpoRalink RT3070 Linux driver
evt file icon file extension evtMicrosoft Windows 2000 and XP event log
bcs file icon file extension bcsMicrosoft Windows 95 browse information
htt file icon file extension httMicrosoft HyperText template
gr2 file icon file extension gr2Microsoft Windows screen driver
 file extension tmcWindows trace message control data
 file extension pdrWindows Port device driver data
 file extension pciPCI miniport data
 file extension vgdVGA CADD display driver
component file icon file extension componentmacOS system component
h1t file icon file extension h1tMicrosoft Windows Assistance Platform client help related data
 file extension fidMicrosoft Windows index
 file extension augRed Hat Linux shellvars file
log1 file icon file extension log1Microsoft Windows registry hive log
 file extension bash_historyBash history data
savedsearch file icon file extension savedsearchSpotlight saved search
 file extension inpSony HD camera system
cub file icon file extension cubWindows Installer validation module
h1k file icon file extension h1kKeyword index - Microsoft Windows Assistance Platform client help related data
 file extension jfsLinux/Unix Journaling file system
 file extension vcnNCDrive Vacon NX system software data
 file extension gzpGazelle system page
 file extension seedLinux preseed data
 file extension rwmWindows Imaging Resource only image
 file extension vmltVMLF related data
 file extension cdmNovell NetWare disk drivers NPA
mci file icon file extension mciMedia Control Interface command script
dbl file icon file extension dblMicrosoft Windows XP product activation data
vtd file icon file extension vtdMicrosoft Windows custom virtual device driver
 file extension documentrevisions-v100macOS (OS X) data
 file extension bbfwiTunes firmware update
 file extension easOS/2 extended file attributes
mnu file icon file extension mnuMS-DOS mouse menu
 file extension oemOEM install data
jnilib file icon file extension jnilibJava JNI library
 file extension rfwRockchip firmware
mlb file icon file extension mlbMicrosoft Windows Mobile media library
mapimail file icon file extension mapimailWindows Send To Mail Recipient data
log2 file icon file extension log2Microsoft Windows registry hive log 2
 file extension xmoAdobe Authorware movie driver
fx file icon file extension fxMicrosoft Windows prefetch data
 file extension tciMityDSP-L138 / MityDSP-6748 memory modules cache
 file extension nkeySilicon Graphics Onyx4 data
wrs file icon file extension wrsCorel WordPerfect windows printer driver
system file icon file extension systemmacOS (OS X) system data
 file extension nosJNOS system data
shsh file icon file extension shshiOS ECID SHSH data
vga file icon file extension vgaBitmap image
 file extension hx1Microsoft Windows data
 file extension fwlFileWrangler EXE library
vrs file icon file extension vrsCorel WordPerfect video resource device driver
 file extension p5xMicrosoft Windows system data
 file extension llsWindows system file
 file extension muiAmiga MUI default class/library data
 file extension tbsTuneUp style boot screen
 file extension dwcEmulex DWC firmware update file format
 file extension fileAS/400 physical data
 file extension esnMicrosoft Windows XP System32 cache
kdmp file icon file extension kdmpMicrosoft Windows crash dump data
msn file icon file extension msnMicrosoft Windows network related data
 file extension pxeLinux, Unix network bootable image
grl file icon file extension grlMicrosoft Windows Update status data
 file extension iotHitachi Ladder Editor IO comment
ins file icon file extension insMicrosoft Windows Internet Naming Service
qtz file icon file extension qtzMac Quartz graphics
 file extension pr2dBase IV printer driver
uce file icon file extension uceMicrosoft Windows XP system32 data
grb file icon file extension grbMS-DOS Shell Monitor data
 file extension ia64HP-UX data
 file extension dll_1029Microsoft Windows Dynamic Link Library
mydocs file icon file extension mydocsSend to My Documents
 file extension araATI Radeon video driver
 file extension ext2Linux second extended file system
 file extension lowPDP-10 low segment of a two-segment program
scap file icon file extension scapScap Mac OS X data
hhc file icon file extension hhcHTML Help table of contents
 file extension install_backupAVG shell extension module
 file extension journal_info_blockApple Mac filesystem
 file extension srecMotorola S-Records data
 file extension bash_profileBash interactive login shell
 file extension failurerequestsmacOS (OS X) data
lproj file icon file extension lprojMac localized project folder
 file extension htwMicrosoft Windows data
kext file icon file extension kextApple Mac kernel extension
 file extension uaqMicrosoft Windows action queue file
ina file icon file extension inaMS-DOS data
sucatalog file icon file extension sucatalogOS X (macOS) software update SUCatalog
 file extension xncModbus Slave XNC driver application
colorpicker file icon file extension colorpickerApple Mac OS X color picker component
 file extension aqlAOL DLL library
 file extension pd0SonTek firmware
 file extension wdrPsion Series 3 printer driver
hdmp file icon file extension hdmpMicrosoft Windows heap dump data
 file extension dat_tureg_oldWindows Registry data
pmr file icon file extension pmrMicrosoft Windows Performance Monitor report
 file extension jlbPAC Mate BX keyboard driver
 file extension sdbWindows Compatibility Solution Database
 file extension spkgMicrosoft Windows Phone driver package
 file extension rm7Casio registration memory data
oth file icon file extension othMicrosoft PowerToys Explorer tool data
 file extension badaSamsung bada data
supported file icon file extension supportedMAC OS X file
 file extension hhkMicrosoft HTML help index
tha file icon file extension thaMicrosoft Windows Shell Common DLL file
 file extension lztHP StoreEver 1/8 G2 firmware data
prd file icon file extension prdMicrosoft Word for DOS printer driver
 file extension ffwFesto Firmware file
 file extension apple_partition_mapApple partition scheme
fs file icon file extension fsMac OS X file system plug-in
 file extension hcdHuawei system data
 file extension ublDM35x user boot loader data
 file extension qkyLinux Quirky kernel data
 file extension vetVET antivirus system file
 file extension filemacOS (OS X) data
 file extension idx_dllMicrosoft Office IDX_DLL file
 file extension zexZOOM MRS-802 system data
qds file icon file extension qdsMicrosoft Windows Server saved DsQuery data
 file extension cgkBlueSoleil data
 file extension lnUNIX lint data
 file extension cnvMicrosoft Word text conversion data
$03 file icon file extension $03MS-DOS pipe
 file extension _dlDynamic Link Library DLL file form
286 file icon file extension 286Microsoft Windows virtual device driver
 file extension grmMicrosoft Windows data
 file extension nvunVidia graphic driver data
bridgesupport file icon file extension bridgesupportbridgesupport Mac OS X file extension
 file extension trx_dllMicrosoft Office dynamic link library
pol file icon file extension polMicrosoft Windows policy data
 file extension devicemanifest-msMicrosoft Windows device metadata
 file extension bsdiffCygwin data
inf file icon file extension infAutostart CDROM script
 file extension hsancillaryMac OS data
 file extension aqmCP/M information data
 file extension sdbCustom Application Compatibility Database
 file extension crpMSI SecureDoc encrypted data
 file extension cxnConexant driver
rco file icon file extension rcoSony PlayStation Portable PSP resource file
 file extension cgzLinux drivers archive
 file extension ltnCD-ROM driver
 file extension qtsQuickTime system data
 file extension nldAMD ATI Radeon video driver
 file extension hamNovell NetWare disk drivers NPA
 file extension rbhRBH Access Technologies firmware
 file extension qprOS/2 print queue device driver
prt file icon file extension prtMicrosoft Windows directory
 file extension 1092Microsoft Windows data
 file extension profileBash shell profile
 file extension restorelistMicrosoft Windows file system permission
 file extension cqSYSGEN replacement data
 file extension 4fsPuppy Linux saved state
 file extension hxiMicrosoft Help compiled storage file
rgu file icon file extension rguMicrosoft Windows Mobile registry entry
 file extension o00Always Technology SCSI Controller Driver
 file extension 3grWindows Screen Grabber for MS-DOS applications VGA graphics driver
 file extension fstabFile system table
wdgt file icon file extension wdgtApple Mac OS X Dashboard widget
 file extension n90Apple iOS kernel cache
 file extension dohGeoworks GEOS dependency information
 file extension mpaPalm memo
 file extension rsWindows Rating System rating data
 file extension wpxAdobe printer description
h1f file icon file extension h1fMicrosoft Windows Assistance Platform client help data
 file extension os2OS/2 system data
 file extension ~btMicrosoft Windows update directory
 file extension rsqIBM 4690 Operating System​ data
searchindexcache file icon file extension searchindexcacheApple Mac OS X (macOS) index cache
 file extension 8xuTexas Instruments TI-83 Plus operating system data
 file extension 2grWindows VGA graphic drivers
 file extension equivIBM AIX host file
 file extension lgpMicrosoft Windows application log
 file extension tnrGPS Pathfinder ProXR/XRS firmware
 file extension ls_Unix ls directory
 file extension emmExpanded memory manager data
 file extension lgxMicrosoft Windows received message data
32s file icon file extension 32sWin32s data
prs file icon file extension prsNorton Viewer DLL library
scr file icon file extension scrMS-DOS DEBUG input
qfilter file icon file extension qfilterMac ColorSync filter data
monitorpanel file icon file extension monitorpanelApple Mac display panel plug-in file type
ov4 file icon file extension ov4Overlay data
ov1 file icon file extension ov1Overlay file
 file extension intSony HD camera system data
mdimporter file icon file extension mdimporterSpotlight importer setting file
bootefisignature file icon file extension bootefisignatureMac system data
 file extension dbfseventsdMac OS X data
adm file icon file extension admAdministrator policy template
msdm file icon file extension msdmMicrosoft Windows system data
udf file icon file extension udfWindows NT/XP uniqueness database
 file extension gr3Graphics device driver
h1v file icon file extension h1vMicrosoft Windows Assistance Platform task metadata
 file extension fgdump-logMicrosoft Windows fgdump data
 file extension 001Unix system file
 file extension styDirectMusic style data
nib file icon file extension nibAdobe AIR data
installhelper file icon file extension installhelperApple Mac Install Helper document
 file extension efiresExtensible Firmware Interface image
 file extension grdDrivers for GRX
 file extension _vti_binSharePoint data
 file extension sgnSlax boot file
 file extension nxdAdaOS debugging information for a module
iswp file icon file extension iswpApple iTunes iOS firmware update
 file extension migtableMicrosoft Windows data
 file extension pcmLaserJet Printer Cartridge Metric for printer driver
 file extension $$$OS/2 operating system file type
saver file icon file extension saverMac OS X Screen Saver
 file extension xdslD-link router UK firmware update
 file extension lexLex or Flex data
mkext file icon file extension mkextMac Mach kernel extension memory cache
000 file icon file extension 000CHKDSK found folder
 file extension vfsVirtual file system index
 file extension budMicrosoft Windows binary printer description
vid file icon file extension vidMS-DOS video driver
 file extension 3~6Microsoft Windows 3.x system data
osax file icon file extension osaxAppleScript scripting addition data
 file extension sf0Microsoft Windows sytem file check data
 file extension sfeLogomatic v2 system data
 file extension cdevMacintosh II control panel data
 file extension afsFreeBSD data
 file extension ox2Orangutan X2 firmware update
 file extension m$sMindStor firmware update
 file extension sparcSunOS 4 data
 file extension cpyAtari Ramdrive CPY commands
 file extension ratMicrosoft Windows rating system data
 file extension n90apiPhone Jailbreak firmware
 file extension cpiMicrosoft MS-DOS code page information
 file extension ecwSystem dll library
 file extension riscosAcorn RISC OS data
xms file icon file extension xmsMicrosoft eXtended Memory specification data
 file extension n81Apple iOS kernel cache
 file extension nu4Norton Utilities DLL root data
 file extension 500Linux data
 file extension 0PSERVER printer queue information data
 file extension slHP-UX shared library
 file extension bLILO Boot Loader image
prefpane file icon file extension prefpaneMac OS X System Preference Pane app
 file extension 120Award BIOS upgrade file
woa file icon file extension woaWindows 3.x swap file
 file extension dvdMS-DOS hardware device driver
ion file icon file extension ion4DOS description
 file extension sdrQuickView Pro for DOS soundcard driver
 file extension acvOS/2 audio driver
fll file icon file extension fllVisual FoxPro dynamic link library
str file icon file extension strScreensaver
 file extension 3fsPuppy Linux saved state
 file extension w20Windows 2000 system data
 file extension dsDesktop Korn Shell data
 file extension vxxIOsubsys drive data
 file extension dpbMicrosoft Windows driver related data
 file extension dvcLoseThos partition drive file
sid file icon file extension sidSystems Management Server software inventory
qlgenerator file icon file extension qlgeneratorApple Quick Look plug-in
 file extension fxDirectX D3DXEffect object
 file extension pidCreative Labs driver
 file extension dlmDynamic Link module
 file extension xxtDynamic Link Library
 file extension mvaMatrox video card driver
prf file icon file extension prfMicrosoft Profiler output
icd file icon file extension icdMicrosoft Windows OpenGL installable client driver
 file extension aadFreeBSD package
mod file icon file extension modMicrosoft Windows kernel module
 file extension mojitoLimewire Kademlia data
ov2 file icon file extension ov2Overlay file
mod file icon file extension modMS-DOS implementing support for Windows DLL's
 file extension disSoundweb firmware update
 file extension dirDirectory indicator
 file extension macsApple Mac OS system data
ndrv file icon file extension ndrvApple Mac OS system driver
 file extension cmgcramfs ROM file system package
 file extension mcpAmiga MUI preference class or library
 file extension do7MS-DOS 7 data
dl file icon file extension dlMasked Dynamic Link Library
 file extension osinstallmessagesmacOS system data
tsk file icon file extension tskMicrosoft Windows system32 data
 file extension hpfsOS/2 High Performance File System
 file extension k48Apple iOS kernel cache
spreporter file icon file extension spreporterMac OS X System Profiler Reporter file
 file extension ifsIBM OS/2 installable file system data
 file extension apdIBM Lotus printer driver
 file extension scsiApple HDD setup data
 file extension ftgMicrosoft Windows Help data
aslquery file icon file extension aslqueryApple MAC OS X console query
ov3 file icon file extension ov3Overlay file
 file extension atahdPuppy Linux ATA hard drive flag
 file extension asdLotus screen driver
1pa file icon file extension 1paMicrosoft Windows data
muimanifest file icon file extension muimanifestMicrosoft Windows multilingual user interface data
 file extension b~kMicrosoft Windows 3.x data
 file extension danAMD ATI Radeon video driver
 file extension hlxATI Radeon video driver
 file extension groupLinux system data
 file extension cinOS/2 change control file
 file extension pdlSymbian OS printer driver
 file extension dmdOS/2 Warp device manager driver
ctfsys file icon file extension ctfsysOS X Mach Kernel system data
 file extension mps_MPW Shell data
components file icon file extension componentsmacOS system data
 file extension addAdapter device driver file
 file extension aaUnix data
 file extension rdlSymbian recogniser library
 file extension scdSystems Management Server (SMS) site control file deletion
 file extension kmdClicker module output
ov5 file icon file extension ov5Overlay file
shlb file icon file extension shlbMacOS system data
$b5 file icon file extension $b5ProDOS 16 or GS/OS shell application
 file extension 2sfPuppy Linux data
 file extension updHP universal print driver
 file extension ioplistApple Mac OS X ioplist file
 file extension nstNokia Star Torrent system data
wcx file icon file extension wcxMicrosoft Windows workspace configuration
 file extension kssKDE screen saver
 file extension cachedumpMicrosoft Windows system data
dsr file icon file extension dsrCorel WordPerfect driver data
 file extension rdzMandrake Linux install file
 file extension rppSymbian OS pre-processed resource
 file extension dskNovell NetWare disk driver
 file extension exopcExoPC application data
 file extension chtMicrosoft Windows Chinese noise-word list file
 file extension rtbNAT proxy servers file
 file extension quePDP-10 queue data
 file extension awsActiveWords System file
 file extension nu6Norton Utility system dll library
 file extension pltEPOC software platform data
vap file icon file extension vapNetWare 2 value added process file
 file extension sfOS/2 work place shell attribute storage
 file extension not_terminatedMac OS X audit log
 file extension envHP-95 environment data
 file extension bsdFacetWin bitwise backup set file
 file extension plkAMD ATI Radeon video driver
 file extension hpcSystem dynamic library file
nlm file icon file extension nlmNovell Netware loadable module file
 file extension aliBeOS ALI ata
 file extension chsMicrosoft Windows Chinese noise-word list
 file extension fsNetBSD system data
 file extension flgPuppy Linux partition flag
mob file icon file extension mobPEN Windows device definition file
 file extension cnmMicrosoft Windows application menu options and setup file
 file extension fltOS/2 warp filter device driver file
 file extension irix6Irix 6 file
 file extension qccNiobrata QUCM firmware
 file extension rilGoogle Android radio interface library
 file extension dspDr.Halo graphics display driver
 file extension ircNevo Infra-Red device code file format
 file extension difOS/2 display information file
 file extension novsNovell NetWare Control Center file
 file extension advGravis Ultrasound virtual device driver file
quicktimecomponents file icon file extension quicktimecomponentsMac OS X system file
 file extension finAMD ATI Radeon video driver
icap file icon file extension icapInternet preference file
 file extension sdevApple System 7 Control Strip module
le file icon file extension lele Mac OS X file
 file extension adUNIX application default resource file

Enter any file extension without dot (e.g. pdf)
Search for file extension details and associated application(s)

RSS feed