System Files
Extension File Description File Type
.0
Shared Library Link File
System
.386
Windows Virtual Device Driver
System
.8xu
TI-83 Plus Operating System File
System
.adm
Administrative Template File
System
.adml
Group Policy Language-Specific Administrative Template
System
.admx
Group Policy Administrative Template File
System
.ani
Windows Animated Cursor
System
.ann
Help Annotations
System
.aos
ARCHOS PCtablet Firmware File
System
.bashrc
Bash Non-Interactive Login Shell File
System
.bash_history
Bash History File
System
.bash_profile
Bash Interactive Login Shell File
System
.bio
BIOS File
System
.bmk
Help Bookmarks
System
.bom
Mac OS X Bill of Materials File
System
.cab
Windows Cabinet File
System
.cdmp
WCS Device Model Profile
System
.cgz
Linux Drivers Archive
System
.clb
COM+ Catalog File
System
.cnt
Help Contents File
System
.cpi
Codepage Information File
System
.cpl
Windows Control Panel Item
System
.crash
Mac OS X Crash Log File
System
.cur
Windows Cursor
System
.desklink
Desktop Shortcut
System
.dev
Windows Device Driver File
System
.diagcab
Troubleshooting Pack Cabinet File
System
.diagcfg
Troubleshooting Pack Configuration File
System
.diagpkg
Troubleshooting Pack File
System
.dll
Dynamic Link Library
System
.dlx
Renamed DLL File
System
.dmp
Windows Memory Dump
System
.drv
Device Driver
System
.dss
DCC Active Designer File
System
.dvd
DOS Device Driver
System
.dyc
Xerox Printer Driver Configuration File
System
.edj
Enlightenment Theme File
System
.efi
Extensible Firmware Interface File
System
.elf
Executable and Linkable Format File
System
.emerald
Emerald Theme
System
.etl
Microsoft Event Trace Log File
System
.evt
Windows Event Viewer Log File
System
.evtx
Windows 7 Event Log File
System
.ffa
Find Fast Status File
System
.ffl
Find Fast Document List
System
.ffo
Find Fast Document Properties Cache
System
.ffx
Microsoft Find Fast Index
System
.fpbf
Mac OS X Burn Folder
System
.ftg
Full Text Group
System
.fts
Full Text Search
System
.gmmp
WCS Gamut Map Model Profile
System
.grl
Windows Update Status File
System
.group
Windows Contacts Group File
System
.grp
Windows Program Manager Group
System
.hdmp
Windows Heap Dump
System
.hhc
HTML Help Table of Contents
System
.hhk
HTML Help Index
System
.hlp
Windows Help File
System
.hpj
Help Project File
System
.htt
Hypertext Template File
System
.icl
Windows Icon Library File
System
.icns
Mac OS X Icon Resource File
System
.ico
Icon File
System
.idx
Index File
System
.ins
Internet Naming Service File
System
.ion
4DOS File Description
System
.its
Internet Document Set
System
.job
Windows Task Scheduler Job File
System
.kbd
Keyboard Layout Script
System
.kext
Mac OS X Kernel Extension
System
.key
Security Key
System
.ko
Linux Kernel Module File
System
.lnk
File Shortcut
System
.log1
Windows Registry Hive Log File
System
.log2
Windows Registry Hive Log 2 File
System
.manifest
Windows Visual Styles File
System
.mapimail
Send To Mail Recipient
System
.mbr
Master Boot Record File
System
.mdmp
Windows Minidump
System
.mem
Parallels Desktop Memory Dump File
System
.metadata_never_index
Spotlight Never Index File
System
.mi4
Audio Player Firmware File
System
.mlc
Microsoft Language Interface Pack
System
.mobileconfig
Apple Mobile Configuration File
System
.msc
Microsoft Management Console Snap-in Control File
System
.msp
Windows Installer Patch
System
.msstyle
Windows XP Unsigned Style
System
.msstyles
Windows XP Style
System
.mui
Multilingual User Interface File
System
.mum
Windows Vista Update Package
System
.mydocs
Send To My Documents
System
.nb0
Device Boot Loader Image
System
.nfo
System Information File
System
.nls
Microsoft National Language Support File
System
.nt
Windows NT Startup File
System
.p7b
PKCS #7 Certificate File
System
.panic
Kernel Panic File
System
.pdr
Windows Port Driver
System
.pfx
PKCS #12 Certificate File
System
.pid
Creative Driver File
System
.pk2
Silkroad Online Game Data File
System
.pnf
Precompiled INF File
System
.pol
Windows Policy File
System
.ppd
PostScript Printer Description File
System
.prefpane
Mac OS X System Preference Pane
System
.prf
Windows System File
System
.printerexport
Windows Printer Migration File
System
.profile
Bash Shell Profile
System
.prt
Printer Driver File
System
.pwl
Windows Password List
System
.qvm
Q Virtual Machine
System
.rco
PlayStation Portable Resource File
System
.reg
Registry File
System
.rfw
Rockchip Firmware File
System
.rmt
Router Firmware File
System
.ruf
Samsung DVD and Blu-ray Player Firmware File
System
.savedsearch
Spotlight Saved Search
System
.saver
Mac OS X Screen Saver
System
.sbn
Cisco IP Phone Firmware File
System
.scf
Windows Explorer Command
System
.scr
Windows Screensaver
System
.sdb
Custom Application Compatibility Database
System
.sfcache
ReadyBoost Cache File
System
.so.0
Unix Shared Library File
System
.sqm
Service Quality Monitoring File
System
.str
Windows Screensaver File
System
.swp
Swap File
System
.sys
Windows System File
System
.theme
Microsoft Plus! Desktop Theme
System
.vga
VGA Display Driver
System
.vgd
Generic CADD VGA Driver
System
.vxd
Virtual Device Driver
System
.wdf
Windows Driver Foundation File
System
.wdgt
Dashboard Widget
System
.webpnp
Web Point and Print File
System
.wer
Windows Error Report
System
.wph
Phoenix BIOS File
System
.wpx
Printer Description File
System
.xrm-ms
Microsoft Security Certificate
System