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 DDZ File Extension Adaptec Unix Driver
70 DESKLINK File Extension Desktop Shortcut
71 DESKTHEMEPACK File Extension Windows 8 Desktop Theme Pack Format
72 DEV File Extension Windows Device Driver Format
73 DEVICEMANIFEST-MS File Extension Microsoft Windows Device Metadata
74 DFU File Extension IOS DFU Format
75 DIAGCAB File Extension Troubleshooting Pack Cabinet Format
76 DIAGCFG File Extension Troubleshooting Pack Configuration Format
77 DIAGPKG File Extension Troubleshooting Pack Format
78 DIMAX File Extension DiMAX Firmware Image Format
79 DIT File Extension Active Directory Information Tree Format
80 DLL File Extension Dynamic Link Library
81 DMP File Extension Windows Memory Dump
82 DO7 File Extension DOS 7
83 DOCUMENTREVISIONS-V100 File Extension MacOS (OS X) Data Format
84 DOH File Extension Geoworks GEOS Dependency Information
85 DOS File Extension WIN95/ DOS 7 System
86 DRPM File Extension Delta RPM Format
87 DRV File Extension Device Driver
88 DYC File Extension Xerox Printer Driver Configuration Format
89 EBD File Extension Windows EBD System Format
90 EDJ File Extension Enlightenment Theme Format
91 EFI File Extension Extensible Firmware Interface Format
92 EFIRES File Extension EFI Image Format
93 EMERALD File Extension Emerald Theme
94 EQUIV File Extension IBM AIX System Format.
95 ESN File Extension Windows XP System32
96 ETL File Extension Microsoft Event Trace Log Format
97 EVT File Extension Windows Event Viewer Log Format
98 EVTX File Extension Windows 7 Event Log Format
99 EXT2 File Extension Linux Second Extended System
100 FAILUREREQUESTS File Extension MacOS (OS X) Data Format
101 FFA File Extension Find Fast Status Format
102 FFL File Extension Find Fast Document List
103 FFO File Extension Find Fast Document Properties Cache
104 FGDUMP-LOG File Extension Microsoft Windows Fgdump Data Format
105 FOLDER File Extension Microsoft Windows Explorer Folder
106 FOTA File Extension Firmware Over-the-Air Format
107 FPBF File Extension Mac OS X Burn Folder
108 FSEVENTSD File Extension MAC OS X
109 FSTAB File Extension File System Table
110 FTG File Extension Full Text Group
111 FWL File Extension FileWrangler EXE Library
112 GMMP File Extension WCS Gamut Map Model Profile
113 GRL File Extension Windows Update Status Format
114 GROUP File Extension Windows Contacts Group Format
115 H1C File Extension Windows Vista Format Related To Assistance Platform (AP) Help
116 H1F File Extension Microsoft Windows Assistance Platform Client Help
117 H1K File Extension Keyword Index - Microsoft Windows Assistance Platform Client Help Related
118 H1S File Extension Windows Assistance Platform Help Format
119 H1T File Extension Microsoft Windows Assistance Platform Client Help Related
120 H1V File Extension Task Metadata - Microsoft Windows Assistance Platform Client Help Related
121 HDMP File Extension Windows Heap Dump
122 HELP File Extension Mac OS X Help Book
123 HHC File Extension HTML Help Table Of Contents
124 HHK File Extension HTML Help Index
125 HIV File Extension Windows Registry Hive Format
126 HLP File Extension Windows Help Format
127 HPC File Extension System Dynamic Library
128 HPFS File Extension OS/2 High Performance Format System
129 HPJ File Extension Help Project Format
130 HSH File Extension Windows Catalog Search Index Format
131 HTT File Extension Hypertext Template Format
132 HTW File Extension Windows
133 HV File Extension Microsoft Windows Mobile Hive
134 HX1 File Extension Microsoft Windows Data Format
135 HXI File Extension Microsoft Help Compiled Storage
136 IA64 File Extension HP-UX
137 ICL File Extension Windows Icon Library Format
138 ICNS File Extension Mac OS X Icon Resource Format
139 ICO File Extension Icon Format
140 ICONPACKAGE File Extension IconPackager Theme Format
141 IDENTIFIER File Extension Microsoft Windows Zone Identifier
142 IDX_DLL File Extension Microsoft Office IDX_DLL
143 IFW File Extension INTUS Firmware Format
144 IME File Extension Windows Input Method Editor Format
145 IMG3 File Extension IPhone IMG3 Format
146 INA File Extension MS-DOS
147 INF_LOC File Extension Windows Driver Information Cache Format
148 INSTALL_BACKUP File Extension AVG Shell Extension Module
149 INTERNETCONNECT File Extension Apple Internet Connect Document
150 ION File Extension File Description Format
151 IOPLIST File Extension Mac OS X IOPLIST Format
152 IPOD File Extension Rockbox Firmware Format
153 IPTHEME File Extension IconPackager Raw Theme Format
154 IRIX6 File Extension Irix 6
155 ISWP File Extension Apple ITunes IOS Firmware Update
156 ITEMDATA-MS File Extension Windows 8 Start Screen Item Data Format
157 IUS File Extension InfoTMIC Firmware Update Format
158 JFS File Extension Linux/Unix Journaling System
159 JLB File Extension PAC Mate BX Keyboard Driver
160 JOB File Extension Windows Task Scheduler Job Format
161 JOURNAL_INFO_BLOCK File Extension Apple Mac OS Xsystem
162 JPN File Extension Windows Japanese Noise-Word List Format
163 K48 File Extension Apple IOS Kernel Cache
164 KBD File Extension Keyboard Layout Script
165 KEXT File Extension Mac OS X Kernel Extension
166 KO File Extension Linux Kernel Module Format
167 KOR File Extension Windows Korean Noise-Words List Format
168 LE File Extension Le Mac OS X
169 LFS File Extension Samsung Phone Params.lfs Format
170 LGS File Extension Microsoft Windows Application Log
171 LIBRARY-MS File Extension Windows Library Description Format
172 LLS File Extension Windows System
173 LN File Extension UNIX Lint
174 LNK File Extension Windows Format Shortcut
175 LOCALIZED File Extension MAC OS X
176 LOCATION File Extension Microsoft Windows 10 Registry Data Format
177 LOCKFILE File Extension Mac OS X PLIST Lock Format
178 LOG1 File Extension Windows Registry Hive Log Format
179 LOG2 File Extension Windows Registry Hive Log 2 Format
180 LPD File Extension Lookout Protocol Driver Format
181 LS_ File Extension Unix Ls Directory
182 LTN File Extension CD-ROM Driver Format
183 MANIFEST File Extension Windows Application Manifest Format
184 MAPIMAIL File Extension Send To Mail Recipient
185 MARKER File Extension Microsoft Windows 10 System Data Format
186 MDIMPORTER File Extension Spotlight Importer Setting
187 MDMP File Extension Windows Minidump
188 METADATA_NEVER_INDEX File Extension Spotlight Never Index Format
189 MI4 File Extension Audio Player Firmware Format
190 MKEXT File Extension Mac OS X Mach Kernel Extension Memory Cache
191 MLC File Extension Microsoft Language Interface Pack
192 MOBILECONFIG File Extension Apple Mobile Configuration Format
193 MOJITO File Extension Limewire Kademlia
194 MONITORPANEL File Extension Apple Mac OS X Display Panel Extension
195 MPS_ File Extension MPW Shell
196 MQ File Extension Microsoft Windows Message Data Format
197 MSC File Extension Microsoft Management Console Snap-in Control Format
198 MSDM File Extension Microsoft Windows
199 MSP File Extension Windows Installer Patch
200 MSSTYLE File Extension Windows XP Unsigned Style
201 MSSTYLES File Extension Windows XP Style
202 MTZ File Extension MIUI Theme
203 MUI File Extension Multilingual User Interface Format
204 MUIMANIFEST File Extension Microsoft Windows Multilingual User Interface
205 MUI_CCCD5AE0 File Extension Hid User Library
206 MUM File Extension Windows Vista Update Package
207 MYDOCS File Extension Send To My Documents
208 N81 File Extension Apple IOS Kernel Cache
209 N90 File Extension Apple IOS Kernel Cache
210 N90AP File Extension IPhone Jailbreak Firmware
211 NBH File Extension ROM Update Utility Image Format
212 NETWORKCONNECT File Extension Apple Network Connect Document
213 NLS File Extension Microsoft National Language Support Format
214 NOS File Extension JDOS System
215 NOT_TERMINATED File Extension Mac OS X Audit Log
216 NOVS File Extension Novell NetWare Control Center
217 NT File Extension Windows NT Startup Format
218 NTFS File Extension NTFS Partition Format
219 NU4 File Extension Norton Utilities DLL Root
220 NXS File Extension AdaOS Support Module Format
221 OS2 File Extension Os2 System
222 OSAX File Extension FindFile OSAX Mac Format Type
223 OSINSTALLMESSAGES File Extension MacOS System Data Format
224 OV1 File Extension Overlay
225 OV3 File Extension Overlay
226 OV4 File Extension Overlay
227 OV5 File Extension Overlay
228 P5X File Extension Windows System
229 PANIC File Extension Kernel Panic Format
230 PAYLOAD File Extension Microsoft Windows Mobile
231 PCI File Extension PCI Miniport
232 PDR File Extension Windows Port Driver
233 PF File Extension Windows Prefetch Format
234 PFX File Extension PKCS #12 Certificate Format
235 PK2 File Extension Silkroad Online Game Data Format
236 PNF File Extension Precompiled INF Format
237 PPD File Extension PostScript Printer Description Format
238 PR2 File Extension DBase IV Printer Driver
239 PREFPANE File Extension Mac OS X System Preference Pane
240 PRINTEREXPORT File Extension Windows Printer Migration Format
241 PROFILE File Extension Bash Shell Profile
242 PROVISIONPROFILE File Extension Apple Provision Profile
243 PWL File Extension Windows Password List
244 PXE File Extension Linux, Unix Network Bootable
245 QFILTER File Extension Mac OS X ColorSync Filter
246 QKY File Extension Quirky Kernel
247 QTS File Extension QuickTime System
248 QUICKTIMECOMPONENTS File Extension Mac OS X System
249 RC1 File Extension Samsung Mobile Device Firmware Format
250 RCO File Extension PlayStation Portable Resource Format
251 RDZ File Extension Mandrake Linux Install
252 REG File Extension Registry Format
253 REGTRANS-MS File Extension Registry Transaction Log Format
254 RESTORELIST File Extension Microsoft Windows Format System Permission Format
255 RFW File Extension Rockchip Firmware Format
256 RGU File Extension Microsoft Windows Mobile Registry Entry
257 RIO File Extension IBM AIX System
258 RISCOS File Extension Acorn RISC OS
259 RMT File Extension Router Firmware Format
260 RRA File Extension Windows Installer Temporary Format Format
261 RSQ File Extension IBM 4690 Operating System​
262 RTP File Extension Microsoft Software Update Format
263 RWM File Extension Windows Imaging Resource Only
264 RX File Extension MS-DOS 7
265 SAVEDSEARCH File Extension Spotlight Saved Search
266 SAVER File Extension Mac OS X Screen Saver
267 SBF File Extension Android System Format
268 SCAP File Extension EFI Firmware Format
269 SCF File Extension Windows Explorer Command
270 SCHEMAS File Extension GConf Schema Definition Format
271 SCR File Extension Windows Screensaver
272 SEARCHCONNECTOR-MS File Extension Windows Search Connector Format
273 SEARCHINDEXCACHE File Extension Mac OS X Cache
274 SERVICE File Extension Mac OS X Service Application
275 SF0 File Extension Windows Sytem Check
276 SFCACHE File Extension ReadyBoost Cache Format
277 SHA File Extension Unix SHAR Archive
278 SHD File Extension Windows Print Job Shadow Format
279 SHSH File Extension IPhone/iPod Touch SHSH Blob Format
280 SO0 File Extension Unix Shared Library Format
281 SP3 File Extension Microsoft Windows XP With Service Pack 3 Installation Format
282 SPL File Extension Windows Print Spool Format
283 SPREPORTER File Extension Mac OS X System Profiler Reporter
284 SQM File Extension Service Quality Monitoring Format
285 SUPPORTED File Extension MAC OS X
286 SYS File Extension Windows System Format
287 TDZ File Extension Drobo Firmware Format
288 THA File Extension Windows Thai Noise-Words List Format
289 THEME File Extension Microsoft Plus! Desktop Theme
290 TNR File Extension GPS Pathfinder ProXR/XRS Firmware
291 TRX_DLL File Extension Windows Startup Format
292 UAQ File Extension Microsoft Windows Action Queue
293 UCE File Extension Windows UCE System Format
294 VCN File Extension NCDrive Vacon NX System Software
295 VET File Extension VET Antivirus System
296 VGA File Extension VGA Display Driver
297 VGD File Extension Generic CADD VGA Driver
298 VMLT File Extension VMLF Related Data Format
299 VRS File Extension Corel WordPerfect Video Resource Device Driver
300 VTD File Extension Microsoft Windows Custom Virtual Device Driver
301 VXD File Extension Virtual Device Driver
302 VX_ File Extension Compressed Virtual Device Driver Format
303 WDGT File Extension Dashboard Widget
304 WEBPNP File Extension Web Point And Print Format
305 WER File Extension Windows Error Report
306 WGZ File Extension S60 Web Runtime Widget Package
307 WRS File Extension Corel WordPerfect Windows Printer Driver
308 WSS File Extension Microsoft Windows Sound System
309 XMO File Extension Adobe Authorware Movie Driver
310 XMS File Extension Microsoft EXtended Memory Specification
311 XP File Extension WindowBlinds Temporary Format
312 XRM-MS File Extension Microsoft Security Certificate
313 ZEX File Extension ZOOM MRS-802 System
314 ZONEIDENTIFIER File Extension Windows Zone Identifier Format
315 _DL File Extension Dynamic Link Library DLL Format Form
316 _VTI_BIN File Extension SharePoint
Top File Extensions
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File Extension of the day
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DDD

Adobe Distiller Format

Files with the DDD extension are associated with the Adobe Distiller software, used for purpose of managing PDF files. DDD files are used by server...