SYSTEM FILE FORMAT Find your Files extension with their applicant

.386 Windows Virtual Device Driver
.8xu TI-83 Plus Operating System File
.adm Administrative Template File
.ani Windows Animated Cursor
.ann Help Annotations
.aos ARCHOS PCtablet Firmware File
.bio BIOS File
.bmk Help Bookmarks
.bom Mac OS X Bill of Materials File
.cab Windows Cabinet File
.cgz Linux Drivers Archive
.clb COM+ Catalog File
.cnt Help Contents File
.cpi Codepage Information File
.cpl Windows Control Panel
.crash Mac OS X Crash Log File
.cur Windows Cursor
.desklink Desktop Shortcut
.dev Windows Device Driver File
.dll Dynamic Link Library
.dlx Renamed DLL File
.dmp Windows Memory Dump
.drv Device Driver
.dss DCC Active Designer File
.dvd DOS Device Driver
.dyc Xerox Printer Driver Configuration File
.emerald Emerald Theme
.ffa Find Fast Status File
.ffl Find Fast Document List
.ffo Find Fast Document Properties Cache
.ffx Microsoft Find Fast Index
.fpbf Mac OS X Burn Folder
.ftg Full Text Group
.fts Full Text Search
.grl Windows Update Status File
.grp Windows Program Manager Group
.hdmp Windows Heap Dump
.hhc HTML Help Table of Contents
.hhk HTML Help Index
.hlp Windows Help File
.hpj Help Project File
.htt Hypertext Template File
.icl Windows Icon Library File
.icns Mac OS X Icon Resource File
.ico Icon File
.idx Index File
.ins Internet Naming Service File
.ion 4DOS File Description
.its Internet Document Set
.kbd Keyboard Layout Script
.kext Mac OS X Kernel Extension
.key Security Key
.ko Linux Kernel Module File
.lnk File Shortcut
.log1 Windows Registry Hive Log File
.log2 Windows Registry Hive Log 2 File
.manifest Windows Visual Styles File
.mapimail Send To Mail Recipient
.mdmp Windows Minidump
.mem Parallels Desktop Memory Dump File
.metadata_never_index Spotlight Never Index File
.mi4 Audio Player Firmware File
.msc Microsoft Management Console Snap-in Control File
.msp Windows Installer Patch Common
.msstyle Windows XP Unsigned Style
.msstyles Windows XP Style
.mui MultiLanguage Resource File
.mum Windows Vista Update Package
.mydocs Send To My Documents
.nfo System Information File
.nls Microsoft National Language Support File
.nt Windows NT Startup File
.p7b PKCS #7 Certificate File
.panic Kernel Panic File
.pdr Windows Port Driver
.pfx PKCS #12 Certificate File
.pid Creative Driver File
.pk2 Silkroad Online Game Data File
.pol Windows Policy File
.ppd PostScript Printer Description File
.prefpane Mac OS X System Preference Pane
.prf Windows System File
.prt Printer Driver File
.pwl Windows Password List
.qvm Q Virtual Machine
.rco PlayStation Portable Resource File
.reg Registry File
.rfw Rockchip Firmware File
.rmt Router Firmware File
.ruf Samsung DVD and Blu-ray Player Firmware File
.savedsearch Spotlight Saved Search
.saver Mac OS X Screen Saver
.scf Windows Explorer Command
.scr Windows Screensaver
.sdb Custom Application Compatibility Database
.str Windows Screensaver File
.swp Swap File
.sys Windows System File
.sys Motorola Driver File
.theme Microsoft Plus! Desktop Theme
.vga VGA Display Driver
.vgd Generic CADD VGA Driver
.vxd Virtual Device Driver
.wdf Windows Driver Foundation File
.wdgt Dashboard Widget
.wer Windows Error Report
.wpx Printer Description File
.xrm-ms Microsoft Security Certificate