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System Files

#File extensionThe 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 Format
4 2GR File Extension Windows VGA Graphic Drivers
5 32S File Extension Win32s
6 386 File Extension Windows Virtual Device Driver
7 3FS File Extension Puppy Linux Save State Format
8 3~6 File Extension Windows 3.xx System
9 500 File Extension Linux
10 73U File Extension TI-73 Explorer Operating System Format
11 8XU File Extension TI-83 Plus Operating System Format
12 AAD File Extension FreeBSD
13 ACCESS File Extension Java Access Control
14 ACCT File Extension IBM AIX System
15 ADM File Extension Administrative Template Format
16 ADML File Extension Microsoft Administrative Language-specific XML Template Format
17 ADMX File Extension Group Policy Administrative Template Format
18 ADUPS File Extension Google Android Data Format
19 AIX File Extension IBM AIX
20 AML File Extension Microsoft Assistance Markup Language
21 ANI File Extension Animated Cursor
22 ANN File Extension Help Annotations
23 AOS File Extension ARCHOS PCtablet Firmware Format
24 APDISK File Extension Apple Mac OS X Related
25 APPLEDOUBLE File Extension Apple AppleDouble Resource
26 APPLE_PARTITION_MAP File Extension Apple Partition Scheme
27 AQL File Extension AOL DLL
28 ASEC File Extension Android Secure Application Format
29 ATAHD File Extension ATA Hard Drive Flag Format
30 AUG File Extension Red Hat Linux Shellvars
31 AUTOMATICDESTINATIONS-MS File Extension Windows Jump List Format
32 BADA File Extension Samsung Bada Data Format
33 BASHRC File Extension Bash Non-Interactive Login Shell Format
34 BASH_HISTORY File Extension Bash History Format
35 BASH_PROFILE File Extension Bash Interactive Login Shell Format
36 BBFW File Extension ITunes Firmware
37 BCD File Extension Windows Boot Configuration Data Format
38 BK2 File Extension Windows Indexing Service Data Format
39 BLF File Extension Microsoft Windows Vista And Windows 7 Registry Format
40 BNR File Extension Nintento Wii Homebrew
41 BOM File Extension Mac OS X Bill Of Materials Format
42 BOOTEFISIGNATURE File Extension Bootefisignature Mac OS X System
43 BRIDGESUPPORT File Extension Bridgesupport Mac OS X Format Extension
44 BSDIFF File Extension Cygwin
45 BUD File Extension Binary Printer Description Format
46 BZI File Extension Dariks Boot And Nuke Kernel Data Format
47 B~K File Extension Microsoft Windows 3.x Data Format
48 C32 File Extension Syslinux COM32 Module
49 CAB File Extension Windows Cabinet Format
50 CACHEDUMP File Extension Microsoft Windows System Data Format
51 CAT File Extension Microsoft Security Catalog Format
52 CB File Extension Microsoft Clean Boot
53 CDMP File Extension WCS Device Model Profile
54 CGK File Extension BlueSoleil
55 CGZ File Extension Linux Drivers Archive
56 CHS File Extension Windows Chinese Noise-Word List Format
57 CNS File Extension Windows 2000 Client Connection Manager Export Format
58 CNT File Extension Help Contents Format
59 COMPONENTS File Extension Mac OS X System
60 CONFIGPROFILE File Extension Apple Configuration Profile
61 CPL File Extension Windows Control Panel Item
62 CPQ File Extension Compaq OEM Disc Configuration Format
63 CQ File Extension SYSGEN Replacement Data Format
64 CRASH File Extension Mac OS X Crash Log Format
65 CRMLOG File Extension Microsoft Windows CRM Log
66 CTFSYS File Extension OS X Mach Kernel System
67 CUR File Extension Windows Cursor
68 DAT_TUREG_OLD File Extension Windows Registry
69 DBFSEVENTSD File Extension Mac OS X Data Format
70 DDZ File Extension Adaptec Unix Driver
71 DESKLINK File Extension Desktop Shortcut
72 DESKTHEMEPACK File Extension Windows 8 Desktop Theme Pack Format
73 DEV File Extension Windows Device Driver Format
74 DEVICEMANIFEST-MS File Extension Microsoft Windows Device Metadata
75 DFU File Extension IOS DFU Format
76 DIAGCAB File Extension Troubleshooting Pack Cabinet Format
77 DIAGCFG File Extension Troubleshooting Pack Configuration Format
78 DIAGPKG File Extension Troubleshooting Pack Format
79 DIMAX File Extension DiMAX Firmware Image Format
80 DIT File Extension Active Directory Information Tree Format
81 DLL File Extension Dynamic Link Library
82 DLL_1029 File Extension Microsoft Windows Dynamic Link Library Format
83 DMP File Extension Windows Memory Dump
84 DO7 File Extension DOS 7
85 DOCUMENTREVISIONS-V100 File Extension MacOS (OS X) Data Format
86 DOH File Extension Geoworks GEOS Dependency Information
87 DOS File Extension WIN95/ DOS 7 System
88 DRPM File Extension Delta RPM Format
89 DRV File Extension Device Driver
90 DYC File Extension Xerox Printer Driver Configuration Format
91 EBD File Extension Windows EBD System Format
92 EDJ File Extension Enlightenment Theme Format
93 EFI File Extension Extensible Firmware Interface Format
94 EFIRES File Extension EFI Image Format
95 EMERALD File Extension Emerald Theme
96 EMM File Extension Expanded Memory Manager Data Format
97 EQUIV File Extension IBM AIX System Format.
98 ESN File Extension Windows XP System32
99 ETL File Extension Microsoft Event Trace Log Format
100 EVT File Extension Windows Event Viewer Log Format
101 EVTX File Extension Windows 7 Event Log Format
102 EXT2 File Extension Linux Second Extended System
103 EXT4 File Extension Fourth Extended Formatsystem Format
104 FAILUREREQUESTS File Extension MacOS (OS X) Data Format
105 FFA File Extension Find Fast Status Format
106 FFL File Extension Find Fast Document List
107 FFO File Extension Find Fast Document Properties Cache
108 FGDUMP-LOG File Extension Microsoft Windows Fgdump Data Format
109 FOLDER File Extension Microsoft Windows Explorer Folder
110 FOTA File Extension Firmware Over-the-Air Format
111 FPBF File Extension Mac OS X Burn Folder
112 FSEVENTSD File Extension MAC OS X
113 FSTAB File Extension File System Table
114 FTG File Extension Full Text Group
115 FWL File Extension FileWrangler EXE Library
116 GMMP File Extension WCS Gamut Map Model Profile
117 GRL File Extension Windows Update Status Format
118 GROUP File Extension Windows Contacts Group Format
119 H1C File Extension Windows Vista Format Related To Assistance Platform (AP) Help
120 H1F File Extension Microsoft Windows Assistance Platform Client Help
121 H1K File Extension Keyword Index - Microsoft Windows Assistance Platform Client Help Related
122 H1S File Extension Windows Assistance Platform Help Format
123 H1T File Extension Microsoft Windows Assistance Platform Client Help Related
124 H1V File Extension Task Metadata - Microsoft Windows Assistance Platform Client Help Related
125 HDMP File Extension Windows Heap Dump
126 HELP File Extension Mac OS X Help Book
127 HHC File Extension HTML Help Table Of Contents
128 HHK File Extension HTML Help Index
129 HIV File Extension Windows Registry Hive Format
130 HLP File Extension Windows Help Format
131 HPC File Extension System Dynamic Library
132 HPFS File Extension OS/2 High Performance Format System
133 HPJ File Extension Help Project Format
134 HSH File Extension Windows Catalog Search Index Format
135 HTT File Extension Hypertext Template Format
136 HTW File Extension Windows
137 HV File Extension Microsoft Windows Mobile Hive
138 HX1 File Extension Microsoft Windows Data Format
139 HXI File Extension Microsoft Help Compiled Storage
140 IA64 File Extension HP-UX
141 ICL File Extension Windows Icon Library Format
142 ICNS File Extension Mac OS X Icon Resource Format
143 ICO File Extension Icon Format
144 ICONPACKAGE File Extension IconPackager Theme Format
145 IDENTIFIER File Extension Microsoft Windows Zone Identifier
146 IDX_DLL File Extension Microsoft Office IDX_DLL
147 IFW File Extension INTUS Firmware Format
148 IM4P File Extension Apple IOS IMG4 Payload Data Format
149 IME File Extension Windows Input Method Editor Format
150 IMG3 File Extension IPhone IMG3 Format
151 INA File Extension MS-DOS
152 INF_LOC File Extension Windows Driver Information Cache Format
153 INSTALL_BACKUP File Extension AVG Shell Extension Module
154 INTERNETCONNECT File Extension Apple Internet Connect Document
155 ION File Extension File Description Format
156 IOPLIST File Extension Mac OS X IOPLIST Format
157 IPOD File Extension Rockbox Firmware Format
158 IPTHEME File Extension IconPackager Raw Theme Format
159 IRIX6 File Extension Irix 6
160 ISWP File Extension Apple ITunes IOS Firmware Update
161 ITEMDATA-MS File Extension Windows 8 Start Screen Item Data Format
162 IUS File Extension InfoTMIC Firmware Update Format
163 JFS File Extension Linux/Unix Journaling System
164 JLB File Extension PAC Mate BX Keyboard Driver
165 JOB File Extension Windows Task Scheduler Job Format
166 JOURNAL_INFO_BLOCK File Extension Apple Mac OS Xsystem
167 JPN File Extension Windows Japanese Noise-Word List Format
168 K48 File Extension Apple IOS Kernel Cache
169 KBD File Extension Keyboard Layout Script
170 KEXT File Extension Mac OS X Kernel Extension
171 KO File Extension Linux Kernel Module Format
172 KOR File Extension Windows Korean Noise-Words List Format
173 LE File Extension Le Mac OS X
174 LFS File Extension Samsung Phone Params.lfs Format
175 LGS File Extension Microsoft Windows Application Log
176 LIBRARY-MS File Extension Windows Library Description Format
177 LLS File Extension Windows System
178 LN File Extension UNIX Lint
179 LNK File Extension Windows Format Shortcut
180 LOCALIZED File Extension MAC OS X
181 LOCATION File Extension Microsoft Windows 10 Registry Data Format
182 LOCKFILE File Extension Mac OS X PLIST Lock Format
183 LOG1 File Extension Windows Registry Hive Log Format
184 LOG2 File Extension Windows Registry Hive Log 2 Format
185 LPD File Extension Lookout Protocol Driver Format
186 LS_ File Extension Unix Ls Directory
187 LTN File Extension CD-ROM Driver Format
188 MANIFEST File Extension Windows Application Manifest Format
189 MAPIMAIL File Extension Send To Mail Recipient
190 MARKER File Extension Microsoft Windows 10 System Data Format
191 MDIMPORTER File Extension Spotlight Importer Setting
192 MDMP File Extension Windows Minidump
193 METADATA_NEVER_INDEX File Extension Spotlight Never Index Format
194 MI4 File Extension Audio Player Firmware Format
195 MIGTABLE File Extension Microsoft Windows Data Format
196 MKEXT File Extension Mac OS X Mach Kernel Extension Memory Cache
197 MLC File Extension Microsoft Language Interface Pack
198 MOBILECONFIG File Extension Apple Mobile Configuration Format
199 MOJITO File Extension Limewire Kademlia
200 MONITORPANEL File Extension Apple Mac OS X Display Panel Extension
201 MPS_ File Extension MPW Shell
202 MQ File Extension Microsoft Windows Message Data Format
203 MSC File Extension Microsoft Management Console Snap-in Control Format
204 MSDM File Extension Microsoft Windows
205 MSP File Extension Windows Installer Patch
206 MSSTYLE File Extension Windows XP Unsigned Style
207 MSSTYLES File Extension Windows XP Style
208 MTZ File Extension MIUI Theme
209 MUI File Extension Multilingual User Interface Format
210 MUIMANIFEST File Extension Microsoft Windows Multilingual User Interface
211 MUI_CCCD5AE0 File Extension Hid User Library
212 MUM File Extension Windows Vista Update Package
213 MYDOCS File Extension Send To My Documents
214 N81 File Extension Apple IOS Kernel Cache
215 N90 File Extension Apple IOS Kernel Cache
216 N90AP File Extension IPhone Jailbreak Firmware
217 NBH File Extension ROM Update Utility Image Format
218 NETWORKCONNECT File Extension Apple Network Connect Document
219 NLS File Extension Microsoft National Language Support Format
220 NOS File Extension JDOS System
221 NOT_TERMINATED File Extension Mac OS X Audit Log
222 NOVS File Extension Novell NetWare Control Center
223 NT File Extension Windows NT Startup Format
224 NTFS File Extension NTFS Partition Format
225 NU4 File Extension Norton Utilities DLL Root
226 NXS File Extension AdaOS Support Module Format
227 OS2 File Extension Os2 System
228 OSAX File Extension FindFile OSAX Mac Format Type
229 OSINSTALLMESSAGES File Extension MacOS System Data Format
230 OV1 File Extension Overlay
231 OV3 File Extension Overlay
232 OV4 File Extension Overlay
233 OV5 File Extension Overlay
234 P5X File Extension Windows System
235 PANIC File Extension Kernel Panic Format
236 PAYLOAD File Extension Microsoft Windows Mobile
237 PCI File Extension PCI Miniport
238 PDR File Extension Windows Port Driver
239 PF File Extension Windows Prefetch Format
240 PFX File Extension PKCS #12 Certificate Format
241 PK2 File Extension Silkroad Online Game Data Format
242 PNF File Extension Precompiled INF Format
243 PPD File Extension PostScript Printer Description Format
244 PR2 File Extension DBase IV Printer Driver
245 PREFPANE File Extension Mac OS X System Preference Pane
246 PRINTEREXPORT File Extension Windows Printer Migration Format
247 PROFILE File Extension Bash Shell Profile
248 PROVISIONPROFILE File Extension Apple Provision Profile
249 PWL File Extension Windows Password List
250 PXE File Extension Linux, Unix Network Bootable
251 QFILTER File Extension Mac OS X ColorSync Filter
252 QKY File Extension Quirky Kernel
253 QTS File Extension QuickTime System
254 QUICKTIMECOMPONENTS File Extension Mac OS X System
255 RC1 File Extension Samsung Mobile Device Firmware Format
256 RCO File Extension PlayStation Portable Resource Format
257 RDZ File Extension Mandrake Linux Install
258 REG File Extension Registry Format
259 REGTRANS-MS File Extension Registry Transaction Log Format
260 RESTORELIST File Extension Microsoft Windows Format System Permission Format
261 RFW File Extension Rockchip Firmware Format
262 RGU File Extension Microsoft Windows Mobile Registry Entry
263 RIO File Extension IBM AIX System
264 RISCOS File Extension Acorn RISC OS
265 RMT File Extension Router Firmware Format
266 RRA File Extension Windows Installer Temporary Format Format
267 RSQ File Extension IBM 4690 Operating System​
268 RTP File Extension Microsoft Software Update Format
269 RWM File Extension Windows Imaging Resource Only
270 RX File Extension MS-DOS 7
271 SAVEDSEARCH File Extension Spotlight Saved Search
272 SAVER File Extension Mac OS X Screen Saver
273 SBF File Extension Android System Format
274 SCAP File Extension EFI Firmware Format
275 SCF File Extension Windows Explorer Command
276 SCHEMAS File Extension GConf Schema Definition Format
277 SCR File Extension Windows Screensaver
278 SEARCHCONNECTOR-MS File Extension Windows Search Connector Format
279 SEARCHINDEXCACHE File Extension Mac OS X Cache
280 SERVICE File Extension Mac OS X Service Application
281 SF0 File Extension Windows Sytem Check
282 SFCACHE File Extension ReadyBoost Cache Format
283 SHA File Extension Unix SHAR Archive
284 SHD File Extension Windows Print Job Shadow Format
285 SHSH File Extension IPhone/iPod Touch SHSH Blob Format
286 SO0 File Extension Unix Shared Library Format
287 SP3 File Extension Microsoft Windows XP With Service Pack 3 Installation Format
288 SPL File Extension Windows Print Spool Format
289 SPREPORTER File Extension Mac OS X System Profiler Reporter
290 SQM File Extension Service Quality Monitoring Format
291 SUPPORTED File Extension MAC OS X
292 SYS File Extension Windows System Format
293 TDZ File Extension Drobo Firmware Format
294 THA File Extension Windows Thai Noise-Words List Format
295 THEME File Extension Microsoft Plus! Desktop Theme
296 TNR File Extension GPS Pathfinder ProXR/XRS Firmware
297 TRX_DLL File Extension Windows Startup Format
298 UAQ File Extension Microsoft Windows Action Queue
299 UCE File Extension Windows UCE System Format
300 VCN File Extension NCDrive Vacon NX System Software
301 VET File Extension VET Antivirus System
302 VGA File Extension VGA Display Driver
303 VGD File Extension Generic CADD VGA Driver
304 VMLT File Extension VMLF Related Data Format
305 VRS File Extension Corel WordPerfect Video Resource Device Driver
306 VTD File Extension Microsoft Windows Custom Virtual Device Driver
307 VXD File Extension Virtual Device Driver
308 VX_ File Extension Compressed Virtual Device Driver Format
309 WDGT File Extension Dashboard Widget
310 WEBPNP File Extension Web Point And Print Format
311 WER File Extension Windows Error Report
312 WGZ File Extension S60 Web Runtime Widget Package
313 WRS File Extension Corel WordPerfect Windows Printer Driver
314 WSS File Extension Microsoft Windows Sound System
315 X86 File Extension Microsoft Office Dynamic Link Library Format
316 XMO File Extension Adobe Authorware Movie Driver
317 XMS File Extension Microsoft EXtended Memory Specification
318 XP File Extension WindowBlinds Temporary Format
319 XRM-MS File Extension Microsoft Security Certificate
320 ZEX File Extension ZOOM MRS-802 System
321 ZONEIDENTIFIER File Extension Windows Zone Identifier Format
322 _DL File Extension Dynamic Link Library DLL Format Form
323 _VTI_BIN File Extension SharePoint
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REG

Registry Format

Windows registry files can be saved with REG extension. It is a plain text file that can be opened using any text editor or web browser after chang...

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