File extension	The full name of the file	Popularity
File extension 0	Shared Library Link File
File extension 000	Indexing Service Data File
File extension 2FS	Puppy Linux Save State File
File extension 386	Windows Virtual Device Driver
File extension 3FS	Puppy Linux Save State File
File extension 73U	TI-73 Explorer Operating System File
File extension 8XU	TI-83 Plus Operating System File
File extension ADM	Administrative Template File
File extension ADML	Microsoft administrative language-specific XML template file
File extension ADMX	Group Policy Administrative Template File
File extension ADV	Audio Driver File
File extension AML	Microsoft Assistance Markup Language
File extension ANI	Animated cursor
File extension ANN	Help Annotations
File extension AOS	ARCHOS PCtablet Firmware File
File extension ASEC	Android Secure Application File
File extension ATAHD	ATA Hard Drive Flag File
File extension AUTOMATICDESTINATIONS-MS	Windows Jump List File
File extension BASHRC	Bash Non-Interactive Login Shell File
File extension BASH_HISTORY	Bash History File
File extension BASH_PROFILE	Bash Interactive Login Shell File
File extension BCD	Windows Boot Configuration Data File
File extension BIN	Router Firmware File
File extension BIO	BIOS File
File extension BK1	Windows Indexing Service File
File extension BK2	Windows Indexing Service Data File
File extension BLF	Microsoft Windows Vista and Windows 7 registry file
File extension BMK	Help Bookmarks
File extension BOM	Mac OS X Bill of Materials File
File extension BUD	Binary Printer Description File
File extension C32	Syslinux COM32 Module
File extension CAB	Windows Cabinet File
File extension CAT	Microsoft Security Catalog file
File extension CDMP	WCS Device Model Profile
File extension CGZ	Linux Drivers Archive
File extension CHK	Netgear Router Firmware File
File extension CHS	Windows Chinese Noise-Word List File
File extension CHT	Windows Chinese Traditional Noise-Word List File
File extension CNS	Windows 2000 Client Connection Manager Export file
File extension CNT	Help Contents File
File extension CONFIGPROFILE	Apple Configuration Profile
File extension CPI	Codepage Information File
File extension CPL	Windows Control Panel Item
File extension CPQ	Compaq OEM Disc Configuration File
File extension CPR	Windows Phone Display Settings File
File extension CRASH	Mac OS X Crash Log File
File extension CUR	Windows Cursor
File extension DAT	Windows Registry Hive File
File extension DESKLINK	Desktop Shortcut
File extension DESKTHEMEPACK	Windows 8 Desktop Theme Pack File
File extension DEV	Windows Device Driver File
File extension DFU	iOS DFU File
File extension DIAGCAB	Troubleshooting Pack Cabinet File
File extension DIAGCFG	Troubleshooting Pack Configuration File
File extension DIAGPKG	Troubleshooting Pack File
File extension DIMAX	DiMAX Firmware Image File
File extension DIT	Active Directory Information Tree File
File extension DLL	Dynamic Link Library
File extension DLX	Renamed DLL File
File extension DMP	Windows Memory Dump
File extension DRPM	Delta RPM File
File extension DRV	Device Driver
File extension DSS	DCC Active Designer File
File extension DVD	DOS Device Driver
File extension DYC	Xerox Printer Driver Configuration File
File extension EBD	Windows EBD System File
File extension EDJ	Enlightenment Theme File
File extension EFI	Extensible Firmware Interface File
File extension EFIRES	EFI Image File
File extension EMERALD	Emerald Theme
File extension ETL	Microsoft Event Trace Log File
File extension EVT	Windows Event Viewer Log File
File extension EVTX	Windows 7 Event Log File
File extension FFA	Find Fast Status File
File extension FFL	Find Fast Document List
File extension FFO	Find Fast Document Properties Cache
File extension FFX	Microsoft Find Fast Index
File extension FID	Microsoft Catalog Indexing Service File
File extension FLG	Puppy Linux Partition Flag File
File extension FOTA	Firmware Over-the-Air File
File extension FPBF	Mac OS X Burn Folder
File extension FTG	Full Text Group
File extension FX	ReadyBoot Trace File
File extension GMMP	WCS Gamut Map Model Profile
File extension GRL	Windows Update Status File
File extension GROUP	Windows Contacts Group File
File extension GRP	Windows Program Manager Group
File extension H1S	Windows Assistance Platform Help File
File extension HDMP	Windows Heap Dump
File extension HELP	Mac OS X Help Book
File extension HHC	HTML Help Table of Contents
File extension HHK	HTML Help Index
File extension HIV	Windows Registry Hive File
File extension HLP	Windows Help File
File extension HPJ	Help Project File
File extension HSH	Windows Catalog Search Index File
File extension HTT	Hypertext Template File
File extension ICL	Windows Icon Library File
File extension ICNS	Mac OS X Icon Resource File
File extension ICO	Icon File
File extension ICONPACKAGE	IconPackager Theme File
File extension IFW	INTUS Firmware File
File extension IME	Windows Input Method Editor File
File extension IMG3	iPhone IMG3 File
File extension INF_LOC	Windows Driver Information Cache File
File extension INS	Internet Naming Service File
File extension INTERNETCONNECT	Apple Internet Connect Document
File extension ION	File Description File
File extension IOPLIST	Mac OS X IOPLIST File
File extension IPOD	Rockbox Firmware File
File extension IPTHEME	IconPackager Raw Theme File
File extension ITEMDATA-MS	Windows 8 Start Screen Item Data File
File extension ITS	Internet Document Set
File extension IUS	InfoTMIC Firmware Update File
File extension JOB	Windows Task Scheduler Job File
File extension JPN	Windows Japanese Noise-Word List File
File extension KBD	Keyboard Layout Script
File extension KEXT	Mac OS X Kernel Extension
File extension KEY	Security Key
File extension KO	Linux Kernel Module File
File extension KOR	Windows Korean Noise-Words List File
File extension LFS	Samsung Phone params.lfs File
File extension LIBRARY-MS	Windows Library Description File
File extension LNK	Windows File Shortcut
File extension LOCKFILE	Mac OS X PLIST Lock File
File extension LOG1	Windows Registry Hive Log File
File extension LOG2	Windows Registry Hive Log 2 File
File extension LPD	Lookout Protocol Driver File
File extension LST	GRUB Boot List File
File extension MANIFEST	Windows Application Manifest File
File extension MAPIMAIL	Send To Mail Recipient
File extension MBR	Master Boot Record File
File extension MDMP	Windows Minidump
File extension ME	Puppy Linux Partition Flag File
File extension MEM	Parallels Desktop Memory Dump File
File extension METADATA_NEVER_INDEX	Spotlight Never Index File
File extension MI4	Audio Player Firmware File
File extension MLC	Microsoft Language Interface Pack
File extension MOBILECONFIG	Apple Mobile Configuration File
File extension MOD	GRUB Module
File extension MSC	Microsoft Management Console Snap-in Control File
File extension MSP	Windows Installer Patch
File extension MSSTYLE	Windows XP Unsigned Style
File extension MSSTYLES	Windows XP Style
File extension MTZ	MIUI Theme
File extension MUI	Multilingual User Interface File
File extension MUI_CCCD5AE0	Hid User Library
File extension MUM	Windows Vista Update Package
File extension MYDOCS	Send To My Documents
File extension NBH	ROM Update Utility Image File
File extension NETWORKCONNECT	Apple Network Connect Document
File extension NFO	System Information File
File extension NLS	Microsoft National Language Support File
File extension NT	Windows NT Startup File
File extension NTFS	NTFS Partition File
File extension OSAX	FindFile OSAX mac file type
File extension PANIC	Kernel Panic File
File extension PAT	DiskStation Manager Installation File
File extension PDR	Windows Port Driver
File extension PF	Windows prefetch file
File extension PFX	PKCS #12 Certificate File
File extension PID	Creative Driver File
File extension PIT	Samsung Phone Firmware File
File extension PK2	Silkroad Online Game Data File
File extension PNF	Precompiled INF File
File extension PPD	PostScript Printer Description File
File extension PPM	Post Programmable Memory File
File extension PREFPANE	Mac OS X System Preference Pane
File extension PRF	Windows System File
File extension PRINTEREXPORT	Windows Printer Migration File
File extension PROFILE	Bash Shell Profile
File extension PROVISIONPROFILE	Apple Provision Profile
File extension PRT	Printer Driver File
File extension PS1	Microsoft Indexing Service Data File
File extension PS2	Microsoft Search Catalog Index File
File extension PWL	Windows Password List
File extension QKY	Quirky Kernel
File extension QVM	Q Virtual Machine
File extension RC1	Samsung Mobile Device Firmware File
File extension RC2	Samsung Mobile Device Firmware File
File extension RCO	PlayStation Portable Resource File
File extension REG	Registry File
File extension REGTRANS-MS	Registry Transaction Log File
File extension RFW	Rockchip Firmware File
File extension RMT	Router Firmware File
File extension RRA	Windows Installer temporary file file
File extension RS	Windows Rating System File
File extension RTP	Microsoft software update file
File extension SAVEDSEARCH	Spotlight Saved Search
File extension SAVER	Mac OS X Screen Saver
File extension SB	Slax Bundle
File extension SBF	Android System File
File extension SBN	Cisco IP Phone Firmware File
File extension SCAP	EFI Firmware File
File extension SCF	Windows Explorer Command
File extension SCHEMAS	GConf Schema Definition File
File extension SCR	Windows Screensaver
File extension SDT	Siemens Desktop Theme File
File extension SEARCHCONNECTOR-MS	Windows Search Connector File
File extension SFCACHE	ReadyBoost Cache File
File extension SHD	Windows Print Job Shadow File
File extension SHSH	iPhone/iPod Touch SHSH Blob File
File extension SO0	Unix Shared Library File
File extension SP3	Microsoft Windows XP with Service Pack 3 installation file
File extension SPL	Windows Print Spool File
File extension SQM	Service Quality Monitoring File
File extension STR	Windows Screensaver File
File extension SWP	Swap File
File extension SYS	Windows System File
File extension TDZ	Drobo Firmware File
File extension THA	Windows Thai Noise-Words List File
File extension THEME	Microsoft Plus! Desktop Theme
File extension TRX_DLL	Windows Startup File
File extension UCE	Windows UCE System File
File extension VGA	VGA Display Driver
File extension VGD	Generic CADD VGA Driver
File extension VXD	Virtual Device Driver
File extension VX_	Compressed Virtual Device Driver File
File extension WDF	Windows Driver Foundation File
File extension WDGT	Dashboard Widget
File extension WEBPNP	Web Point and Print File
File extension WER	Windows Error Report
File extension WGZ	S60 Web Runtime Widget Package
File extension WPX	Printer Description File
File extension XP	WindowBlinds temporary file
File extension XRM-MS	Microsoft Security Certificate
File extension ZONEIDENTIFIER	Windows Zone Identifier File