Loading...

System files

481 file extensions

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.

Top 10 most visited

  1. 1 dat .dat
  2. 2 cat .cat
  3. 3 scr .scr
  4. 4 dll .dll
  5. 5 ocx .ocx
  6. 6 shs .shs
  7. 7 sfcache .sfcache
  8. 8 idx .idx
  9. 9 sys .sys
  10. 10 efi .efi

All file extensions in category: System file

481 file extensions

_dl
._dl
Dynamic Link Library DLL file form
 _ipod_control
._ipod_control
iPod control data file
 _vti_bin
._vti_bin
SharePoint data
 ~bt
.~bt
Microsoft Windows update directory
 $$$
.$$$
OS/2 operating system file type
 $03
.$03
MS-DOS pipe
 $b5
.$b5
ProDOS 16 or GS/OS shell application
 0
.0
Linux shared library link
 0
.0
PSERVER printer queue information data
 000
.000
CHKDSK found folder
 001
.001
Unix system file
 100
.100
Award BIOS Upgrade File version 1.0
 1092
.1092
Microsoft Windows data
 120
.120
Award BIOS upgrade file
 1pa
.1pa
Microsoft Windows data
 211
.211
ASUS BIOS update file
 212
.212
ASUS BIOS update
 286
.286
Microsoft Windows virtual device driver
 2gr
.2gr
Windows VGA graphic drivers
 2sf
.2sf
Puppy Linux data
 3_dpo
.3_dpo
Ralink RT3070 Linux driver
 3~6
.3~6
Microsoft Windows 3.x system data
 32s
.32s
Win32s data
 3fs
.3fs
Puppy Linux saved state
 3gr
.3gr
Windows Screen Grabber for MS-DOS applications VGA graphics driver
 4fs
.4fs
Puppy Linux saved state
 500
.500
Linux data
 8xu
.8xu
Texas Instruments TI-83 Plus operating system data
 aa
.aa
Unix data
 aad
.aad
FreeBSD package
 access
.access
Java access control data
 acct
.acct
IBM AIX system data
 acv
.acv
OS/2 audio driver
 ad
.ad
UNIX application default resource file
 add
.add
Adapter device driver file
 adm
.adm
Administrator policy template
 adups
.adups
Google Android data
 adv
.adv
Gravis Ultrasound virtual device driver file
 afs
.afs
FreeBSD data
 aix
.aix
IBM AIX data
 ali
.ali
BeOS ALI ata
 alx
.alx
BlackBerry application loader
 ami
.ami
AMI BIOS firmware data
 ann
.ann
Microsoft Windows Help annotation
 apd
.apd
IBM Lotus printer driver
 apdisk
.apdisk
Apple macOS disk information data
 apple_partition_map
.apple_partition_map
Apple partition scheme
 appledouble
.appledouble
Apple AppleDouble resource data
 aql
.aql
AOL DLL library
 aqm
.aqm
CP/M information data
 ar
.ar
Linux/Unix command library
 ara
.ara
ATI Radeon video driver
 asd
.asd
Lotus screen driver
 aslquery
.aslquery
Apple MAC OS X console query
 atahd
.atahd
Puppy Linux ATA hard drive flag
 aug
.aug
Red Hat Linux shellvars file
 aws
.aws
ActiveWords System file
 b
.b
LILO Boot Loader image
 b~k
.b~k
Microsoft Windows 3.x data
 bada
.bada
Samsung bada data
 bash_history
.bash_history
Bash history data
 bash_profile
.bash_profile
Bash interactive login shell
 bbfw
.bbfw
iTunes firmware update
 bcd
.bcd
Microsoft Windows boot configuration
 bcs
.bcs
Microsoft Windows 95 browse information
 bif
.bif
Boot information file
 bio
.bio
OS/2 BIOS file
 blf
.blf
Microsoft Windows registry data file
 bnr
.bnr
Nintento Wii homebrew data
 bom
.bom
Apple Mac OS X Bill of Materials
 bootefisignature
.bootefisignature
Mac system data
 bridgesupport
.bridgesupport
bridgesupport Mac OS X file extension
 bsd
.bsd
FacetWin bitwise backup set file
 bsdiff
.bsdiff
Cygwin data
 bud
.bud
Microsoft Windows binary printer description
 bzi
.bzi
Darik's Boot And Nuke kernel data file
 cachedump
.cachedump
Microsoft Windows system data
 cat
.cat
Microsoft Security Catalog
 cb
.cb
Microsoft clean boot data
 cdd
.cdd
Chromeleon device driver
 cdev
.cdev
Macintosh II control panel data
 cdfs
.cdfs
Compact Disc File System
 cdm
.cdm
Novell NetWare disk drivers NPA
 cgk
.cgk
BlueSoleil data
 cgz
.cgz
Linux drivers archive
 chs
.chs
Microsoft Windows Chinese noise-word list
 cht
.cht
Microsoft Windows Chinese noise-word list file
 cin
.cin
OS/2 change control file
 cmg
.cmg
cramfs ROM file system package
 cnm
.cnm
Microsoft Windows application menu options and setup file
 cnv
.cnv
Microsoft Word text conversion data
 colorpicker
.colorpicker
Apple Mac OS X color picker component
 component
.component
macOS system component
 components
.components
macOS system data
 cpi
.cpi
Microsoft MS-DOS code page information
 cpl
.cpl
Microsoft Windows Control Panel data
 cpy
.cpy
Atari Ramdrive CPY commands
 cq
.cq
SYSGEN replacement data
 crmlog
.crmlog
Microsoft Windows CRM log
 crp
.crp
MSI SecureDoc encrypted data
 ctfsys
.ctfsys
OS X Mach Kernel system data
 cub
.cub
Windows Installer validation module
 cxn
.cxn
Conexant driver
 dan
.dan
AMD ATI Radeon video driver
 dat
.dat
Program data
 dat_tureg_old
.dat_tureg_old
Windows Registry data
 dbfseventsd
.dbfseventsd
Mac OS X data
 dbl
.dbl
Microsoft Windows XP product activation data
 ddp
.ddp
OS/2 device driver profile
 ddz
.ddz
Adaptec SCO Unix driver image
 dev
.dev
Windows device driver
 devicemanifest-ms
.devicemanifest-ms
Microsoft Windows device metadata
 dif
.dif
OS/2 display information file
 dio
.dio
iPaq 914c flash data
 dir
.dir
Directory indicator
 dis
.dis
Soundweb firmware update
 dl
.dl
Masked Dynamic Link Library
 dll
.dll
Dynamic Link Library
 dll_1029
.dll_1029
Microsoft Windows Dynamic Link Library
 dlm
.dlm
Dynamic Link module
 dmd
.dmd
OS/2 Warp device manager driver
 do7
.do7
MS-DOS 7 data
 documentrevisions-v100
.documentrevisions-v100
macOS (OS X) data
 doh
.doh
Geoworks GEOS dependency information
 dpb
.dpb
Microsoft Windows driver related data
 drv
.drv
Microsoft Windows device driver
 ds
.ds
Desktop Korn Shell data
 ds_store
.ds_store
macOS folder information
 dsk
.dsk
Novell NetWare disk driver
 dsp
.dsp
Dr.Halo graphics display driver
 dsr
.dsr
Corel WordPerfect driver data
 dt
.dt
Macintosh file data fork
 dump
.dump
Dump data
 dvc
.dvc
LoseThos partition drive file
 dvd
.dvd
MS-DOS hardware device driver
 dwc
.dwc
Emulex DWC firmware update file format
 eas
.eas
OS/2 extended file attributes
 ecd
.ecd
CoCut Plotter printer driver
 ecw
.ecw
System dll library
 efi
.efi
Extensible Firmware Interface
 efires
.efires
Extensible Firmware Interface image
 emm
.emm
Expanded memory manager data
 env
.env
HP-95 environment data
 equiv
.equiv
IBM AIX host file
 esn
.esn
Microsoft Windows XP System32 cache
 etl
.etl
Microsoft Windows trace log
 evt
.evt
Microsoft Windows 2000 and XP event log
 evtx
.evtx
Microsoft Windows event log
 exopc
.exopc
ExoPC application data
 ext2
.ext2
Linux second extended file system
 ext4
.ext4
Fourth extended filesystem
 failurerequests
.failurerequests
macOS (OS X) data
 ffw
.ffw
Festo Firmware file
 fgdump-log
.fgdump-log
Microsoft Windows fgdump data
 fid
.fid
Microsoft Windows index
 file
.file
macOS (OS X) data
 file
.file
AS/400 physical data
 fin
.fin
AMD ATI Radeon video driver
 flg
.flg
Puppy Linux partition flag
 fll
.fll
Visual FoxPro dynamic link library
 flt
.flt
OS/2 warp filter device driver file
 folder
.folder
Microsoft Windows Explorer folder data
 fs
.fs
Mac OS X file system plug-in
 fs
.fs
NetBSD system data
 fseventsd
.fseventsd
macOS (OS X) data
 fstab
.fstab
File system table
 ftg
.ftg
Microsoft Windows Help data
 fwl
.fwl
FileWrangler EXE library
 fx
.fx
DirectX D3DXEffect object
 fx
.fx
Microsoft Windows prefetch data
 gadget
.gadget
Windows sidebar gadget
 gid
.gid
Microsoft Windows Help general index
 gpd
.gpd
Microsoft Windows universal printer unidrv minidriver
 gr2
.gr2
Microsoft Windows screen driver
 gr3
.gr3
Graphics device driver
 grb
.grb
MS-DOS Shell Monitor data
 grd
.grd
Drivers for GRX
 grl
.grl
Microsoft Windows Update status data
 grm
.grm
Microsoft Windows data
 group
.group
Linux system data
 grp
.grp
Microsoft Windows program group
 gzp
.gzp
Gazelle system page
 h1c
.h1c
Windows Vista file related to Assistance Platform (AP) help
 h1f
.h1f
Microsoft Windows Assistance Platform client help data
 h1k
.h1k
Keyword index - Microsoft Windows Assistance Platform client help related data
 h1s
.h1s
Microsoft Windows Assistance Platform client help document
 h1t
.h1t
Microsoft Windows Assistance Platform client help related data
 h1v
.h1v
Microsoft Windows Assistance Platform task metadata
 h86
.h86
CP/M data
 ham
.ham
Novell NetWare disk drivers NPA
 hcd
.hcd
Huawei system data
 hdmp
.hdmp
Microsoft Windows heap dump data
 hhc
.hhc
HTML Help table of contents
 hhk
.hhk
Microsoft HTML help index
 hiv
.hiv
Windows NT registry hive
 hlp
.hlp
Help file
 hlx
.hlx
ATI Radeon video driver
 hpc
.hpc
System dynamic library file
 hpfs
.hpfs
OS/2 High Performance File System
 hsancillary
.hsancillary
Mac OS data
 htt
.htt
Microsoft HyperText template
 htw
.htw
Microsoft Windows data
 hv
.hv
Microsoft Windows Mobile hive
 hx1
.hx1
Microsoft Windows data
 hxi
.hxi
Microsoft Help compiled storage file
 ia64
.ia64
HP-UX data
 icap
.icap
Internet preference file
 icd
.icd
Microsoft Windows OpenGL installable client driver
 identifier
.identifier
Microsoft Windows zone identifier data
 idx
.idx
Index file
 idx_dll
.idx_dll
Microsoft Office IDX_DLL file
 ifs
.ifs
IBM OS/2 installable file system data
 im4p
.im4p
Apple iOS IMG4 payload data
 ina
.ina
MS-DOS data
 inf
.inf
Autostart CDROM script
 inf
.inf
Windows installation script
 inp
.inp
Sony HD camera system
 ins
.ins
Microsoft Windows Internet Naming Service
 install_backup
.install_backup
AVG shell extension module
 installhelper
.installhelper
Apple Mac Install Helper document
 int
.int
Sony HD camera system data
 ion
.ion
4DOS description
 ioplist
.ioplist
Apple Mac OS X ioplist file
 iot
.iot
Hitachi Ladder Editor IO comment
 irc
.irc
Nevo Infra-Red device code file format
 irix6
.irix6
Irix 6 file
 iswp
.iswp
Apple iTunes iOS firmware update
 jfs
.jfs
Linux/Unix Journaling file system
 jlb
.jlb
PAC Mate BX keyboard driver
 jnilib
.jnilib
Java JNI library
 job
.job
Microsoft Windows Task Scheduler task object
 journal_info_block
.journal_info_block
Apple Mac filesystem
 k48
.k48
Apple iOS kernel cache
 kbd
.kbd
Keyboard script file layout
 kdmp
.kdmp
Microsoft Windows crash dump data
 kext
.kext
Apple Mac kernel extension
 key
.key
Microsoft Windows 7 registry key file
 kmd
.kmd
Clicker module output
 ko
.ko
Linux kernel module
 krm
.krm
Kenwood firmware data
 kss
.kss
KDE screen saver
 lan
.lan
Novell NetWare LAN driver
 lbr
.lbr
Lotus 1-2-3 display driver data
 le
.le
le Mac OS X file
 lex
.lex
Lex or Flex data
 lgp
.lgp
Microsoft Windows application log
 lgs
.lgs
Microsoft Windows application log
 lgx
.lgx
Microsoft Windows received message data
 lls
.lls
Windows system file
 ln
.ln
UNIX lint data
 localized
.localized
macOS (OS X) system localization
 location
.location
Microsoft Windows 10 registry data
 lock
.lock
Lock data
 log1
.log1
Microsoft Windows registry hive log
 log2
.log2
Microsoft Windows registry hive log 2
 low
.low
PDP-10 low segment of a two-segment program
 lproj
.lproj
Mac localized project folder
 ls_
.ls_
Unix ls directory
 ltn
.ltn
CD-ROM driver
 lzt
.lzt
HP StoreEver 1/8 G2 firmware data
 m$s
.m$s
MindStor firmware update
 macs
.macs
Apple Mac OS system data
 man
.man
Microsoft Windows 2000/XP mandatory user profile
 mapimail
.mapimail
Windows Send To Mail Recipient data
 marker
.marker
Microsoft Windows 10 system data
 mci
.mci
Media Control Interface command script
 mcp
.mcp
Amiga MUI preference class or library
 mdimporter
.mdimporter
Spotlight importer setting file
 mdmp
.mdmp
Microsoft Windows minidump
 mft
.mft
Microsoft Windows NTFS master file table
 migtable
.migtable
Microsoft Windows data
 mkext
.mkext
Mac Mach kernel extension memory cache
 mlb
.mlb
Microsoft Windows Mobile media library
 mnu
.mnu
MS-DOS mouse menu
 mob
.mob
PEN Windows device definition file
 mod
.mod
Microsoft Windows kernel module
 mod
.mod
MS-DOS implementing support for Windows DLL's
 mof
.mof
Systems Management Server managed object format
 mojito
.mojito
Limewire Kademlia data
 monitorpanel
.monitorpanel
Apple Mac display panel plug-in file type
 mot
.mot
Linux load instructions
 mpa
.mpa
Palm memo
 mpkg
.mpkg
Meta package
 mps_
.mps_
MPW Shell data
 mq
.mq
Microsoft Windows message data
 msc
.msc
Microsoft management console control data
 msdm
.msdm
Microsoft Windows system data
 msn
.msn
Microsoft Windows network related data
 mui
.mui
MultiLanguage Windows resource data
 mui
.mui
Amiga MUI default class/library data
 muimanifest
.muimanifest
Microsoft Windows multilingual user interface data
 mum
.mum
Microsoft Windows Update Package
 mva
.mva
Matrox video card driver
 mydocs
.mydocs
Send to My Documents
 n81
.n81
Apple iOS kernel cache
 n90
.n90
Apple iOS kernel cache
 n90ap
.n90ap
iPhone Jailbreak firmware
 ndrv
.ndrv
Apple Mac OS system driver
 nib
.nib
Adobe AIR data
 nib
.nib
Interface Builder user interface resources
 nkey
.nkey
Silicon Graphics Onyx4 data
 nld
.nld
AMD ATI Radeon video driver
 nlm
.nlm
Novell Netware loadable module file
 nls
.nls
Microsoft National Language Support data
 nos
.nos
JNOS system data
 not_terminated
.not_terminated
Mac OS X audit log
 novs
.novs
Novell NetWare Control Center file
 nst
.nst
Nokia Star Torrent system data
 nu4
.nu4
Norton Utilities DLL root data
 nu6
.nu6
Norton Utility system dll library
 nvu
.nvu
nVidia graphic driver data
 nxd
.nxd
AdaOS debugging information for a module
 nxp
.nxp
AdaOS profiling information for one execution file
 nxs
.nxs
AdaOS support module
 o00
.o00
Always Technology SCSI Controller Driver
 ocx
.ocx
ActiveX Control
 oem
.oem
OEM install data
 os2
.os2
OS/2 system data
 osax
.osax
AppleScript scripting addition data
 osc
.osc
Remote Installation Services client installation wizard
 osinstallmessages
.osinstallmessages
macOS system data
 osp
.osp
Crystal Semiconductor driver data
 oth
.oth
Microsoft PowerToys Explorer tool data
 ov1
.ov1
Overlay file
 ov2
.ov2
Overlay file
 ov3
.ov3
Overlay file
 ov4
.ov4
Overlay data
 ov5
.ov5
Overlay file
 ovi
.ovi
PC-9801 FM system data
 ovl
.ovl
Overlay file
 ox2
.ox2
Orangutan X2 firmware update
 p5x
.p5x
Microsoft Windows system data
 pat
.pat
Synology DiskStation DSM update
 payload
.payload
Microsoft Windows Mobile data
 pbd
.pbd
PowerBuilder dynamic link library
 pcf
.pcf
Microsoft Source Profiler profiler command
 pci
.pci
PCI miniport data
 pcm
.pcm
LaserJet Printer Cartridge Metric for printer driver
 pd0
.pd0
SonTek firmware
 pdl
.pdl
Symbian OS printer driver
 pdr
.pdr
Windows Port device driver data
 pf
.pf
Microsoft Windows prefetch data
 pid
.pid
Creative Labs driver
 pid
.pid
Unix process ID
 plk
.plk
AMD ATI Radeon video driver
 plt
.plt
EPOC software platform data
 pmr
.pmr
Microsoft Windows Performance Monitor report
 pol
.pol
Microsoft Windows policy data
 pr2
.pr2
dBase IV printer driver
 prd
.prd
Microsoft Word for DOS printer driver
 prefpane
.prefpane
Mac OS X System Preference Pane app
 prf
.prf
Microsoft Profiler output
 profile
.profile
Bash shell profile
 prs
.prs
Norton Viewer DLL library
 prt
.prt
Microsoft Windows directory
 psf
.psf
Windows Server Update Services patch storage file
 pxe
.pxe
Linux, Unix network bootable image
 qcc
.qcc
Niobrata QUCM firmware
 qds
.qds
Microsoft Windows Server saved DsQuery data
 qdz
.qdz
Stratix V device driver
 qfilter
.qfilter
Mac ColorSync filter data
 qky
.qky
Linux Quirky kernel data
 qlgenerator
.qlgenerator
Apple Quick Look plug-in
 qpr
.qpr
OS/2 print queue device driver
 qts
.qts
QuickTime system data
 qtz
.qtz
Mac Quartz graphics
 que
.que
PDP-10 queue data
 quicktimecomponents
.quicktimecomponents
Mac OS X system file
 rat
.rat
Microsoft Windows rating system data
 rbh
.rbh
RBH Access Technologies firmware
 rco
.rco
Sony PlayStation Portable PSP resource file
 rdl
.rdl
Symbian recogniser library
 rdz
.rdz
Mandrake Linux install file
 reg
.reg
Windows registry data
 regtrans-ms
.regtrans-ms
Microsoft Windows registry changes temporary data
 rel
.rel
Nintendo Wii relocatable module
 restorelist
.restorelist
Microsoft Windows file system permission
 rfw
.rfw
Rockchip firmware
 rgu
.rgu
Microsoft Windows Mobile registry entry
 ril
.ril
Google Android radio interface library
 rio
.rio
IBM AIX system data
 riscos
.riscos
Acorn RISC OS data
 rm7
.rm7
Casio registration memory data
 rom
.rom
Read Only Memory image
 rpp
.rpp
Symbian OS pre-processed resource
 rs
.rs
Windows Rating System rating data
 rsq
.rsq
IBM 4690 Operating System​ data
 rsrc
.rsrc
MAC OS resource data
 rtb
.rtb
NAT proxy servers file
 rtp
.rtp
Software update
 rwm
.rwm
Windows Imaging Resource only image
 rx
.rx
MS-DOS 7 data
 savedsearch
.savedsearch
Spotlight saved search
 saver
.saver
Mac OS X Screen Saver
 sc
.sc
Framework II display driver
 scap
.scap
Scap Mac OS X data
 scc
.scc
Visual SourceSafe control data
 scd
.scd
Systems Management Server (SMS) site control file deletion
 scexe
.scexe
HP iL02 firmware update
 scr
.scr
MS Windows screensaver
 scr
.scr
MS-DOS DEBUG input
 scsi
.scsi
Apple HDD setup data
 sdb
.sdb
Windows Compatibility Solution Database
 sdb
.sdb
Custom Application Compatibility Database
 sdev
.sdev
Apple System 7 Control Strip module
 sdr
.sdr
QuickView Pro for DOS soundcard driver
 searchindexcache
.searchindexcache
Apple Mac OS X (macOS) index cache
 seed
.seed
Linux preseed data
 service
.service
macOS (OS X) service application data
 sf
.sf
OS/2 work place shell attribute storage
 sf0
.sf0
Microsoft Windows sytem file check data
 sfc
.sfc
Microsoft Windows system file check data
 sfcache
.sfcache
ReadyBoost cache
 sfe
.sfe
Logomatic v2 system data
 sfs
.sfs
Squashfs file archive
 sgn
.sgn
Slax boot file
 sha
.sha
Unix SHAR archive
 shd
.shd
Microsoft Windows shadow spooler file
 shlb
.shlb
MacOS system data
 shs
.shs
Microsoft Windows 95/98 clipboard data
 shsh
.shsh
iOS ECID SHSH data
 sid
.sid
Systems Management Server software inventory
 sif
.sif
Microsoft Windows NT setup installation data
 sl
.sl
HP-UX shared library
 so
.so
ELF shared library
 sparc
.sparc
SunOS 4 data
 spkg
.spkg
Microsoft Windows Phone driver package
 spl
.spl
Microsoft Windows printing spool
 spreporter
.spreporter
Mac OS X System Profiler Reporter file
 srec
.srec
Motorola S-Records data
 str
.str
Screensaver
 strings
.strings
Apple Mac strings
 sty
.sty
DirectMusic style data
 sucatalog
.sucatalog
OS X (macOS) software update SUCatalog
 supported
.supported
MAC OS X file
 swp
.swp
Swap file
 sys
.sys
System file
 system
.system
macOS (OS X) system data
 tbs
.tbs
TuneUp style boot screen
 tci
.tci
MityDSP-L138 / MityDSP-6748 memory modules cache
 tha
.tha
Microsoft Windows Shell Common DLL file
 tlb
.tlb
OLE type library
 tmc
.tmc
Windows trace message control data
 tnr
.tnr
GPS Pathfinder ProXR/XRS firmware
 trx_dll
.trx_dll
Microsoft Office dynamic link library
 tsk
.tsk
Microsoft Windows system32 data
 uaq
.uaq
Microsoft Windows action queue file
 ubl
.ubl
DM35x user boot loader data
 uce
.uce
Microsoft Windows XP system32 data
 udf
.udf
Windows NT/XP uniqueness database
 upd
.upd
HP universal print driver
 uxz
.uxz
IBM Flex CMM update data
 vap
.vap
NetWare 2 value added process file
 vcn
.vcn
NCDrive Vacon NX system software data
 vdx
.vdx
Windows 32-bit system driver
 vet
.vet
VET antivirus system file
 vfs
.vfs
Virtual file system index
 vga
.vga
Bitmap image
 vgd
.vgd
VGA CADD display driver
 vid
.vid
MS-DOS video driver
 vmlt
.vmlt
VMLF related data
 vrs
.vrs
Corel WordPerfect video resource device driver
 vtd
.vtd
Microsoft Windows custom virtual device driver
 vxd
.vxd
Microsoft Windows virtual device driver
 vxx
.vxx
IOsubsys drive data
 w20
.w20
Windows 2000 system data
 wcx
.wcx
Microsoft Windows workspace configuration
 wdf
.wdf
Microsoft Windows Driver Foundation data
 wdgt
.wdgt
Apple Mac OS X Dashboard widget
 wdr
.wdr
Psion Series 3 printer driver
 woa
.woa
Windows 3.x swap file
 wpx
.wpx
Adobe printer description
 wrs
.wrs
Corel WordPerfect windows printer driver
 wss
.wss
Microsoft Windows Sound System
 x86
.x86
Microsoft Office dynamic link library
 xdsl
.xdsl
D-link router UK firmware update
 xmo
.xmo
Adobe Authorware movie driver
 xms
.xms
Microsoft eXtended Memory specification data
 xnc
.xnc
Modbus Slave XNC driver application
 xxt
.xxt
Dynamic Link Library
 zex
.zex
ZOOM MRS-802 system data