System Files
by: Administrator
# File extension The full name of the file
 
1 $03 file extension MS-DOS Pipe
2 286 file extension Microsoft Windows Virtual Device Driver
3 2FS file extension Puppy Linux Save State File
4 32S file extension Win32s
5 386 file extension Windows Virtual Device Driver
6 3FS file extension Puppy Linux Save State File
7 500 file extension Linux
8 73U file extension TI-73 Explorer Operating System File
9 8XU file extension TI-83 Plus Operating System File
10 AAD file extension FreeBSD
11 ACCT file extension IBM AIX System
12 ADM file extension Administrative Template File
13 ADML file extension Microsoft administrative language-specific XML template file
14 ADMX file extension Group Policy Administrative Template File
15 AML file extension Microsoft Assistance Markup Language
16 ANI file extension Animated cursor
17 ANN file extension Help Annotations
18 AOS file extension ARCHOS PCtablet Firmware File
19 AQL file extension AOL DLL
20 ASEC file extension Android Secure Application File
21 ATAHD file extension ATA Hard Drive Flag File
22 AUG file extension Red Hat Linux Shellvars
23 AUTOMATICDESTINATIONS-MS file extension Windows Jump List File
24 BASHRC file extension Bash Non-Interactive Login Shell File
25 BASH_HISTORY file extension Bash History File
26 BASH_PROFILE file extension Bash Interactive Login Shell File
27 BBFW file extension ITunes Firmware
28 BCD file extension Windows Boot Configuration Data File
29 BK2 file extension Windows Indexing Service Data File
30 BLF file extension Microsoft Windows Vista and Windows 7 registry file
31 BNR file extension Nintento Wii Homebrew
32 BOM file extension Mac OS X Bill of Materials File
33 BOOTEFISIGNATURE file extension Bootefisignature Mac OS X System
34 BUD file extension Binary Printer Description File
35 C32 file extension Syslinux COM32 Module
36 CAB file extension Windows Cabinet File
37 CAT file extension Microsoft Security Catalog file
38 CB file extension Microsoft Clean Boot
39 CDMP file extension WCS Device Model Profile
40 CGZ file extension Linux Drivers Archive
41 CHS file extension Windows Chinese Noise-Word List File
42 CNS file extension Windows 2000 Client Connection Manager Export file
43 CNT file extension Help Contents File
44 CONFIGPROFILE file extension Apple Configuration Profile
45 CPL file extension Windows Control Panel Item
46 CPQ file extension Compaq OEM Disc Configuration File
47 CRASH file extension Mac OS X Crash Log File
48 CRMLOG file extension Microsoft Windows CRM Log
49 CTFSYS file extension OS X Mach Kernel System
50 CUR file extension Windows Cursor
51 DAT_TUREG_OLD file extension Windows Registry
52 DDZ file extension Adaptec Unix Driver
53 DESKLINK file extension Desktop Shortcut
54 DESKTHEMEPACK file extension Windows 8 Desktop Theme Pack File
55 DEV file extension Windows Device Driver File
56 DFU file extension iOS DFU File
57 DIAGCAB file extension Troubleshooting Pack Cabinet File
58 DIAGCFG file extension Troubleshooting Pack Configuration File
59 DIAGPKG file extension Troubleshooting Pack File
60 DIMAX file extension DiMAX Firmware Image File
61 DIT file extension Active Directory Information Tree File
62 DLL file extension Dynamic Link Library
63 DMP file extension Windows Memory Dump
64 DO7 file extension DOS 7
65 DOH file extension Geoworks GEOS Dependency Information
66 DOS file extension WIN95/ DOS 7 System
67 DRPM file extension Delta RPM File
68 DRV file extension Device Driver
69 DYC file extension Xerox Printer Driver Configuration File
70 EBD file extension Windows EBD System File
71 EDJ file extension Enlightenment Theme File
72 EFI file extension Extensible Firmware Interface File
73 EFIRES file extension EFI Image File
74 EMERALD file extension Emerald Theme
75 EQUIV file extension IBM AIX System File.
76 ETL file extension Microsoft Event Trace Log File
77 EVT file extension Windows Event Viewer Log File
78 EVTX file extension Windows 7 Event Log File
79 FFA file extension Find Fast Status File
80 FFL file extension Find Fast Document List
81 FFO file extension Find Fast Document Properties Cache
82 FOTA file extension Firmware Over-the-Air File
83 FPBF file extension Mac OS X Burn Folder
84 FSTAB file extension File System Table
85 FTG file extension Full Text Group
86 GMMP file extension WCS Gamut Map Model Profile
87 GRL file extension Windows Update Status File
88 GROUP file extension Windows Contacts Group File
89 H1K file extension Keyword Index - Microsoft Windows Assistance Platform Client Help Related
90 H1S file extension Windows Assistance Platform Help File
91 H1V file extension Task Metadata - Microsoft Windows Assistance Platform Client Help Related
92 HDMP file extension Windows Heap Dump
93 HELP file extension Mac OS X Help Book
94 HHC file extension HTML Help Table of Contents
95 HHK file extension HTML Help Index
96 HIV file extension Windows Registry Hive File
97 HLP file extension Windows Help File
98 HPC file extension System Dynamic Library
99 HPJ file extension Help Project File
100 HSH file extension Windows Catalog Search Index File
101 HTT file extension Hypertext Template File
102 HV file extension Microsoft Windows Mobile Hive
103 IA64 file extension HP-UX
104 ICL file extension Windows Icon Library File
105 ICNS file extension Mac OS X Icon Resource File
106 ICO file extension Icon File
107 ICONPACKAGE file extension IconPackager Theme File
108 IDX_DLL file extension Microsoft Office IDX_DLL
109 IFW file extension INTUS Firmware File
110 IME file extension Windows Input Method Editor File
111 IMG3 file extension iPhone IMG3 File
112 INA file extension MS-DOS
113 INF_LOC file extension Windows Driver Information Cache File
114 INTERNETCONNECT file extension Apple Internet Connect Document
115 ION file extension File Description File
116 IOPLIST file extension Mac OS X IOPLIST File
117 IPOD file extension Rockbox Firmware File
118 IPTHEME file extension IconPackager Raw Theme File
119 ISWP file extension Apple ITunes IOS Firmware Update
120 ITEMDATA-MS file extension Windows 8 Start Screen Item Data File
121 IUS file extension InfoTMIC Firmware Update File
122 JLB file extension PAC Mate BX Keyboard Driver
123 JOB file extension Windows Task Scheduler Job File
124 JOURNAL_INFO_BLOCK file extension Apple Mac OS Xsystem
125 JPN file extension Windows Japanese Noise-Word List File
126 K48 file extension Apple IOS Kernel Cache
127 KBD file extension Keyboard Layout Script
128 KEXT file extension Mac OS X Kernel Extension
129 KO file extension Linux Kernel Module File
130 KOR file extension Windows Korean Noise-Words List File
131 LFS file extension Samsung Phone params.lfs File
132 LIBRARY-MS file extension Windows Library Description File
133 LN file extension UNIX Lint
134 LNK file extension Windows File Shortcut
135 LOCKFILE file extension Mac OS X PLIST Lock File
136 LOG1 file extension Windows Registry Hive Log File
137 LOG2 file extension Windows Registry Hive Log 2 File
138 LPD file extension Lookout Protocol Driver File
139 MANIFEST file extension Windows Application Manifest File
140 MAPIMAIL file extension Send To Mail Recipient
141 MDMP file extension Windows Minidump
142 METADATA_NEVER_INDEX file extension Spotlight Never Index File
143 MI4 file extension Audio Player Firmware File
144 MLC file extension Microsoft Language Interface Pack
145 MOBILECONFIG file extension Apple Mobile Configuration File
146 MONITORPANEL file extension Apple Mac OS X Display Panel Extension
147 MSC file extension Microsoft Management Console Snap-in Control File
148 MSP file extension Windows Installer Patch
149 MSSTYLE file extension Windows XP Unsigned Style
150 MSSTYLES file extension Windows XP Style
151 MTZ file extension MIUI Theme
152 MUI file extension Multilingual User Interface File
153 MUIMANIFEST file extension Microsoft Windows Multilingual User Interface
154 MUI_CCCD5AE0 file extension Hid User Library
155 MUM file extension Windows Vista Update Package
156 MYDOCS file extension Send To My Documents
157 N81 file extension Apple IOS Kernel Cache
158 N90 file extension Apple IOS Kernel Cache
159 NBH file extension ROM Update Utility Image File
160 NETWORKCONNECT file extension Apple Network Connect Document
161 NLS file extension Microsoft National Language Support File
162 NOS file extension JDOS System
163 NT file extension Windows NT Startup File
164 NTFS file extension NTFS Partition File
165 NU4 file extension Norton Utilities DLL Root
166 OSAX file extension FindFile OSAX mac file type
167 OV1 file extension Overlay
168 OV3 file extension Overlay
169 OV4 file extension Overlay
170 P5X file extension Windows System
171 PANIC file extension Kernel Panic File
172 PDR file extension Windows Port Driver
173 PF file extension Windows prefetch file
174 PFX file extension PKCS #12 Certificate File
175 PK2 file extension Silkroad Online Game Data File
176 PNF file extension Precompiled INF File
177 PPD file extension PostScript Printer Description File
178 PR2 file extension DBase IV Printer Driver
179 PREFPANE file extension Mac OS X System Preference Pane
180 PRINTEREXPORT file extension Windows Printer Migration File
181 PROFILE file extension Bash Shell Profile
182 PROVISIONPROFILE file extension Apple Provision Profile
183 PWL file extension Windows Password List
184 PXE file extension Linux, Unix Network Bootable
185 QFILTER file extension Mac OS X ColorSync Filter
186 QKY file extension Quirky Kernel
187 QUICKTIMECOMPONENTS file extension Mac OS X System
188 RC1 file extension Samsung Mobile Device Firmware File
189 RCO file extension PlayStation Portable Resource File
190 RDZ file extension Mandrake Linux Install
191 REG file extension Registry File
192 REGTRANS-MS file extension Registry Transaction Log File
193 RFW file extension Rockchip Firmware File
194 RISCOS file extension Acorn RISC OS
195 RMT file extension Router Firmware File
196 RRA file extension Windows Installer temporary file file
197 RSQ file extension IBM 4690 Operating System​
198 RTP file extension Microsoft software update file
199 RWM file extension Windows Imaging Resource Only
200 SAVEDSEARCH file extension Spotlight Saved Search
201 SAVER file extension Mac OS X Screen Saver
202 SBF file extension Android System File
203 SCAP file extension EFI Firmware File
204 SCF file extension Windows Explorer Command
205 SCHEMAS file extension GConf Schema Definition File
206 SCR file extension Windows Screensaver
207 SEARCHCONNECTOR-MS file extension Windows Search Connector File
208 SFCACHE file extension ReadyBoost Cache File
209 SHD file extension Windows Print Job Shadow File
210 SHSH file extension iPhone/iPod Touch SHSH Blob File
211 SO0 file extension Unix Shared Library File
212 SP3 file extension Microsoft Windows XP with Service Pack 3 installation file
213 SPL file extension Windows Print Spool File
214 SPREPORTER file extension Mac OS X System Profiler Reporter
215 SQM file extension Service Quality Monitoring File
216 SUPPORTED file extension MAC OS X
217 SYS file extension Windows System File
218 TDZ file extension Drobo Firmware File
219 THA file extension Windows Thai Noise-Words List File
220 THEME file extension Microsoft Plus! Desktop Theme
221 TNR file extension GPS Pathfinder ProXR/XRS Firmware
222 TRX_DLL file extension Windows Startup File
223 UAQ file extension Microsoft Windows Action Queue
224 UCE file extension Windows UCE System File
225 VCN file extension NCDrive Vacon NX System Software
226 VET file extension VET Antivirus System
227 VGA file extension VGA Display Driver
228 VGD file extension Generic CADD VGA Driver
229 VTD file extension Microsoft Windows Custom Virtual Device Driver
230 VXD file extension Virtual Device Driver
231 VX_ file extension Compressed Virtual Device Driver File
232 WDGT file extension Dashboard Widget
233 WEBPNP file extension Web Point and Print File
234 WER file extension Windows Error Report
235 WGZ file extension S60 Web Runtime Widget Package
236 WRS file extension Corel WordPerfect Windows Printer Driver
237 WSS file extension Microsoft Windows Sound System
238 XMO file extension Adobe Authorware Movie Driver
239 XMS file extension Microsoft EXtended Memory Specification
240 XP file extension WindowBlinds temporary file
241 XRM-MS file extension Microsoft Security Certificate
242 ZEX file extension ZOOM MRS-802 System
243 ZONEIDENTIFIER file extension Windows Zone Identifier File
244 _DL file extension Dynamic Link Library DLL File Form