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0 .X - Lex Language Source Code Microsoft
1 .X-PNG - Portable (Public) Network Graphic Bitmap Boris Eyrich
2 .X01 - Corel Paradox Secondary Index Corel Corporation
3 .X02 - Corel Paradox Secondary Index Corel Corporation
4 .X03 - Corel Paradox Secondary Index Corel Corporation
5 .X04 - Corel Paradox Secondary Index Corel Corporation
6 .X05 - Corel Paradox Secondary Index Corel Corporation
7 .X06 - Corel Paradox Secondary Index Corel Corporation
8 .X07 - Corel Paradox Secondary Index Corel Corporation
9 .X08 - Corel Paradox Secondary Index Corel Corporation
10 .X09 - Corel Paradox Secondary Index Corel Corporation
11 .X1 - X1 Desktop Search Saved Search X1 Technologies, Inc.
12 .X10 - X Window Bitmap Dump X.Org Foundation
13 .X11 - X Window System Bitmap Image X.Org Foundation
14 .X13 - Hooligans Game Archive Darxabre
15 .X20 - XTree Gold For Dos Help Jeffrey C Johnson (XTree Company)
16 .X32 - Adobe Xtra Format Adobe Systems
17 .X3A - MOTIF XF N/A
18 .X3D - X3D Format MAGIX
19 .X3DB - X3D Binary Format Web3D Consortium
20 .X3DV - Web3D X3D Graphics Image Web3D Consortium
21 .X3F - Sigma Camera RAW Picture Format SIGMA
22 .X3G - MakerBot MakerWare Document MakerBot Industries, LLC
23 .X40 - XtreeGold Dos Help Jeffrey C Johnson (XTree Company)
24 .X4K - XML4King Configuration Format Optimal Performance
25 .X50 - XtreeGold Dos Help Jeffrey C Johnson (XTree Company)
26 .X60 - XTree Gold For Dos Help Jeffrey C Johnson (XTree Company)
27 .X64 - Commodore 64 Emulator Disk Image N/A
28 .X70 - XTree Gold For Dos Help Jeffrey C Johnson (XTree Company)
29 .X80 - Xtree Gold Dos Help Jeffrey C Johnson (XTree Company)
30 .X90 - XTree Gold For Dos Help Jeffrey C Johnson (XTree Company)
31 .XA - Sony PlayStation Audio/video Format Electronic Arts
32 .XA0 - Xtree Gold Dos Help Jeffrey C Johnson (XTree Company)
33 .XAB - Microsoft Outlook Express Address Book Microsoft Corporation
34 .XAC - SimCity Societies Game Electronic Arts, Inc.
35 .XAD - EXotic ADlib Sound Format N/A
36 .XADD - Expression Web Add-in Microsoft
37 .XADML - Amiga Forever XADML Cloanto Italia srl
38 .XAF - Xml Compatible Animation Format Autodesk
39 .XAIML - XAIML Database Format Devyn Collier Johnson
40 .XAML - Windows Markup File Microsoft
41 .XAMLX - XAMLX Document Format Microsoft
42 .XAN - Worms 3D Map Format Team17 Software
43 .XAP - Microsoft Silverlight Application Package Format Microsoft
44 .XAPPL - Virtual Application Studio XML Application Configuration Format Spoon
45 .XAR - Xara Vector Drawing Format MAGIX
46 .XARC - The Longest Journey Audio Funcom
47 .XAS - PTC Pro/Engineer Assembly Format Parametric Technology
48 .XAV - Final Draft AV Document Final Draft, Inc.
49 .XAVC - Sony XAVC Video Format N/A
50 .XB0 - Xtree Gold Dos Help Jeffrey C Johnson (XTree Company)
51 .XBA - OpenOffice.org Basic Module Format Oracle
52 .XBAP - Microsoft Silverlight Application Package Microsoft
53 .XBB - DVIPDFMx Output DVIPDFMx Project Team
54 .XBC - SMART Notebook Format SMART Technologies
55 .XBD - JAXB Schema Oracle Corporation
56 .XBDOC - Xiosis Scribe Document Xiosis
57 .XBE - Xbox Executable Format Microsoft
58 .XBEL - XBEL Bookmarks Format Python XML SIG
59 .XBF - Emperor Battle For Dune Electronic Arts, Inc.
60 .XBK - SMART Notebook Format Citrix
61 .XBL - Extensible Binding Language Format Mozilla
62 .XBLR - Output Raw XBRL N/A
63 .XBM - X Windows System Bitmap Image N/A
64 .XBMML - Braille Music Score N/A
65 .XBMP - Area 51 Game Midway Home Entertainment Inc.
66 .XBN - Xnick Nick Backup HyperG/Smuggl0r
67 .XBPLATE - Xiosis Scribe Template Xiosis
68 .XBRL - Extensible Business Reporting Language N/A
69 .XBSAV - Mass Effect 2 For Xbox Saved Game Format Electronic Arts
70 .XBT - SMART Notebook Template Format SMART Technologies
71 .XBX - Xbox Icon Or Picture Microsoft Corporation
72 .XC0 - Xtree Gold Dos Help Jeffrey C Johnson (XTree Company)
73 .XC3 - Cast3D 3D Scene Cast3D project team
74 .XCAPPDATA - Apple Xcode Application Data Format Apple
75 .XCARCHIVE - Xcode Archive Apple
76 .XCCONFIG - Apple Xcode Configuration Settings Apple, Inc.
77 .XCDATAMODEL - Xcode Core Data Model Format Apple
78 .XCDATAMODELD - Xcode Core Data Model Format Apple
79 .XCEL - Microsoft Excel For Mac Spreadsheet Microsoft Corporation
80 .XCF - GIMP XCF Bitmap Image Format GIMP
81 .XCH - LinkAssistant Project Settings Link-Assistant.com
82 .XCI - Adobe Reader Font Mapping Adobe Systems Incorporated
83 .XCL - XTree For Windows Script Jeffrey C Johnson (XTree Company)
84 .XCM - CmapTools Exported Concept Map IHMC
85 .XCO - Xilinx CORE Generator Log Xilinx, Inc.
86 .XCODE - Xcode Development Project Format Apple
87 .XCODEPLUGIN - Apple Xcode Extension Apple, Inc.
88 .XCODEPROJ - XCode Project Format Apple
89 .XCOF - Mac OS Object Library Apple, Inc.
90 .XCON - Conceal Encrypted Data Ankit Malhotra
91 .XCORPUS - Xaira Corpora University of Oxford
92 .XCP - XLNT Script Command Advanced Systems Concepts, Inc.
93 .XCPLUGIN - Apple Xcode Extension Apple, Inc.
94 .XCPLUGINDATA - Xcode Plug-in Data Apple, Inc.
95 .XCR - Warlords Battlecry Game Enlight Software. Ltd.
96 .XCSCHEME - Apple Xcode Scheme Apple, Inc.
97 .XCSL - CineStyle Color Correction Settings Format Technicolor
98 .XCSNAPSHOTS - Xcode Snapshot Apple
99 .XCT - XVI32 Conversion N/A
100 .XCTL - LabVIEW XControls National Instruments Corporation
101 .XCU - OpenOffice.org Extension Control Format OpenOffice.org
102 .XCUSERSTATE - Xcode Apple, Inc.
103 .XCWORKSPACE - Xcode Workspace Format Apple
104 .XD0 - XtreeGold Dos Help Jeffrey C Johnson (XTree Company)
105 .XDA - Sencha Architect Project Sencha Inc.
106 .XDB - Norton AntiVirus Update Format Symantec
107 .XDC - Total Commander With DarkCrypt IV Plug-in Encrypted TOTALCMD.NET
108 .XDF - Externally Defined Function Autodesk, Inc.
109 .XDFL - XDFL Configuration XDFLengine Team
110 .XDI - WinArchiver Compressed ISO Image Format WinArchiver Computing
111 .XDL - MS SQL Server XML Schema Format N/A
112 .XDO - Oracle BI Publisher Resource Tracking Oracle Corporation
113 .XDOC - QuarkXPress 3.0 Document N/A
114 .XDOCLET - JBoss XDoclet Reference Red Hat, Inc.
115 .XDP - Acrobat XML Data Package Format Adobe Systems
116 .XDR - XML Data Reduced Format Microsoft
117 .XDS - LCDStudio Design Format LCDstudio.com
118 .XDT - Win-Test Extra Data Olivier F5MZN
119 .XDU - Backdoor.Win32.PcClient.xdu N/A
120 .XDV - XeTeX N/A
121 .XDW - DocuWorks Document Format Fuji Xerox
122 .XE0 - XtreeGold Dos Help Jeffrey C Johnson (XTree Company)
123 .XEF - X-Genics EManager Form Data Format N/A
124 .XEJ - Microsoft Expression Encoder Job Format Microsoft
125 .XEL - Microsoft Expression Encoder 3.0 Live Jobs Format Microsoft
126 .XEM - Sybase PowerDesigner Model Definition Format Sybase
127 .XEN - Activision Guitar Hero 3 Data Format Activision
128 .XENSEARCH - XenCenter Saved Search Format Citrix
129 .XEO - Signwave Auto-Illustrator Extension Signwave UK
130 .XEP - EManager File Packing Definition N/A
131 .XEQ - Sage MAS 90 Data The Sage Group plc
132 .XER - Primavera Project Management Propriety Exchange Format Oracle
133 .XES - X-Genics EManager Skins Definition N/A
134 .XESC - Microsoft Expression Encoder Screen Capture Format Microsoft
135 .XET - X-Genics EManager Process Definition N/A
136 .XEV - X-Genics EManager Auto-update Format N/A
137 .XEVGENXML - Adobe Dreamweaver Adobe Systems Incorporated
138 .XEX - Xbox 360 Executable Format Microsoft
139 .XEZ - X-Genics EManager Template Package N/A
140 .XFA - OneCncXR CAD OneCNC LLC
141 .XFBIN - Naruto Shippuden: Ultimate Ninja Storm 2 CyberConnect2
142 .XFC - X-Fonter Font Collection Blacksun Software
143 .XFD - Adobe XFDL Format XML Form Format UWI
144 .XFDF - Adobe Acrobat Forms Document Adobe Systems
145 .XFDL - XFDL Format UWI
146 .XFF - XFRX Database Output Martin Haluza
147 .XFI - XICE Desktop Encrypted xICE.NET
148 .XFL - Adobe Flash Exchange Format Adobe Systems
149 .XFM - OmniForm XML Nuance Communications, Inc.
150 .XFN - Corel Ventura Printer Font N/A
151 .XFO - XSL-FO Formatted Form N/A
152 .XFP - Microsoft SharePoint Extending Form Library Properties Microsoft Corporation
153 .XFR - Ventura Publisher Bitmap Editor Font Format Corel Corporation
154 .XFS - Gunbound Format Softnyx
155 .XFT - Adobe Form Designer Form N/A
156 .XFZ - French FlashCards Vocabulary Declan Software
157 .XG0 - Corel Paradox Secondary Index Corel Corporation
158 .XG1 - Corel Paradox Secondary Index Corel Corporation
159 .XG2 - Corel Paradox Secondary Index Corel Corporation
160 .XG3 - Corel Paradox Secondary Index Corel Corporation
161 .XG4 - Corel Paradox Secondary Index Corel Corporation
162 .XG5 - Corel Paradox Secondary Index Corel Corporation
163 .XGA - Diamond Mind Baseball Game Account Information Imagine Sports
164 .XGD - Xbox 360 Game Disc Layout Microsoft Corporation
165 .XGL - XGL 3D CAD Model N/A
166 .XGLL - EASE SpeakerLab Text AFMG Technologies GmbH
167 .XGML - Graph Modeling Language XML Format N/A
168 .XGMML - XGMML Graph Format N/A
169 .XGO - GeoConcept Add-on GeoConcept SA
170 .XGP - Xfire Profile Patcher Game List Format XGP
171 .XGS - Disk Image Format Microsoft
172 .XHB - HomeBank Data N/A
173 .XHP - OpenOffice.org Extension Help Format OpenOffice.org Project Team
174 .XHT - Extensible HyperText Markup Language Format N/A
175 .XHTM - Extensible HTML Format N/A
176 .XHTML - Extensible HTML Format N/A
177 .XI - Fastracker 2.0 Instrument Format N/A
178 .XIB - Apple Interface Builder Format Apple
179 .XIF - ScanSoft Pagis Format Nuance Communications
180 .XIG - XML Instance Generator N/A
181 .XIL - Xilize SourceForge.net
182 .XILINC - Xilize Defintion SourceForge.net
183 .XILIZE - Xilize Configuration SourceForge.net
184 .XIM - X11 Xim Toolkit Bitmap N/A
185 .XIN - OmniMark Include Stilo International plc
186 .XIP - Xbox Dashboard N/A
187 .XISE - Xilinx ISE Project Format Xilinx
188 .XISO - Xbox ISO xiso
189 .XIT - SpatialAnalyzer New River Kinematics
190 .XIT64 - SpatialAnalyzer New River Kinematics
191 .XIX - IIS NNTP Subject Lists N/A
192 .XIZ - Ximinez SourceForge.net
193 .XJB - OEPE JAXB Wizard Bindings Oracle Corporation
194 .XJT - Compressed GIMP Image The GIMP Team
195 .XKM - X KeyBoard Various Linux developers
196 .XL - Microsoft Excel Spreadsheet Format Microsoft
197 .XLA - Microsoft Excel Add-in Format Microsoft
198 .XLA5 - Microsoft Excel 5 For Mac Add-in Microsoft Corporation
199 .XLA8 - Microsoft Excel 98 For Mac Add-in Microsoft Corporation
200 .XLAM - Microsoft Excel 2007/2010 Open XML Macro-enabled Add-in Format Microsoft
201 .XLAMENX - Egis Encrypted Excel XLAM Egis Technology Inc.
202 .XLA_ - Microsoft Excel 4 For Mac Add-in Microsoft Corporation
203 .XLB - Microsoft Excel Toolbars Format Microsoft
204 .XLB4 - Microsoft Excel 4 For Mac Toolbars Microsoft Corporation
205 .XLB5 - Microsoft Excel 5 For Mac Toolbars Microsoft Corporation
206 .XLB8 - Microsoft Excel 98 For Mac Toolbars Microsoft Corporation
207 .XLBN - Microsoft Excel 1 For Mac Toolbars Microsoft Corporation
208 .XLC - Microsoft Excel Chart Format Microsoft
209 .XLC3 - Microsoft Excel 3 For Mac Chart Microsoft Corporation
210 .XLC4 - Microsoft Excel 4 For Mac Chart Microsoft Corporation
211 .XLC_ - Microsoft Excel 2 For Mac Chart Microsoft Corporation
212 .XLD - Microsoft Excel Dialogue Format Microsoft
213 .XLDB - AQUA Data PRIORITY DISPATCH CORP.
214 .XLF - XLIFF Document Format OASIS
215 .XLG - AutoCAD External Reference Log Autodesk, Inc.
216 .XLGC - ExpressK Database Format Prosystech
217 .XLI - SIEMENS PLM Software NX 7.5 Log Siemens Product Lifecycle Management Software Inc.
218 .XLIFF - XLIFF Localization Format OASIS
219 .XLK - Microsoft Excel Backup Format Microsoft
220 .XLL - Microsoft Excel Add-in Format Microsoft
221 .XLL_ - Microsoft Excel 4 For Mac Add-in Microsoft Corporation
222 .XLM - Microsoft Excel Macro Format Microsoft
223 .XLM3 - Microsoft Excel 3 For Mac Macro Microsoft Corporation
224 .XLM4 - Microsoft Excel 4 For Mac Macro Microsoft Corporation
225 .XLMV - Thunder Mall Video Format N/A
226 .XLMX - Microsoft Excel Macro-enabled Spreadsheet Microsoft Corporation
227 .XLM_ - Microsoft Excel 2 For Mac Macro Microsoft Corporation
228 .XLNK - XML Link Format N/A
229 .XLO - Autodesk Inventor Export Journal Autodesk, Inc.
230 .XLPF - Microsoft Excel For Mac Setting Microsoft Corporation
231 .XLR - Microsoft Works Spreadsheet Or Chart Format Microsoft
232 .XLS - Microsoft Excel 97 To 2003 Workbook Format Microsoft
233 .XLS3 - Microsoft Excel 3 For Mac Spreadsheet Microsoft Corporation
234 .XLS4 - Microsoft Excel 4 For Mac Spreadsheet Microsoft Corporation
235 .XLS5 - Microsoft Excel 5 For Mac Spreadsheet Microsoft Corporation
236 .XLS8 - Microsoft Excel 98 For Mac Spreadsheet Microsoft Corporation
237 .XLSB - Microsoft Excel 2007/2010 Binary Workbook Format Microsoft
238 .XLSENX - Egis Encrypted Excel XLS Egis Technology Inc.
239 .XLSHTML - Microsoft Office Excel HTML Document Format Microsoft
240 .XLSM - Microsoft Excel 2007/2010 Open XML Macro-enabled Workbook Format Microsoft
241 .XLSMHTML - Microsoft Excel MIME HTML Spreadsheet Format Microsoft
242 .XLSX - Microsoft Excel 2007, Excel 2010 And Excel 2013 Open XML Workbook Format Microsoft
243 .XLSXENX - Egis Encrypted Excel XLSX Egis Technology Inc.
244 .XLS_ - Microsoft Excel For Mac Spreadsheet Microsoft Corporation
245 .XLT - Microsoft Excel 97 To 2003 Workbook Template Format Microsoft
246 .XLTHTML - Microsoft Office Excel HTML Template Format Microsoft
247 .XLTM - Microsoft Excel 2007/2010 Open XML Macro-enabled Workbook Template Format Microsoft
248 .XLTX - Microsoft Excel 2007/2010 Open XML Workbook Template Format Microsoft
249 .XLV - Microsoft Excel VBA Module Format Microsoft
250 .XLW - Microsoft Excel Workspace Format Microsoft
251 .XLW3 - Microsoft Excel 3 For Mac Workbook Microsoft Corporation
252 .XLW4 - Microsoft Excel 4 For Mac Workbook Microsoft Corporation
253 .XLW5 - Microsoft Excel 5 For Mac Workbook Microsoft Corporation
254 .XLW_ - Microsoft Excel 2 For Mac Workbook Microsoft Corporation
255 .XLXML - Microsoft Excel XML Worksheet Microsoft Corporation
256 .XLZ - Crossword Power Tools Crossword Library CPT
257 .XM - FastTracker 2 Instrument Fasttracker
258 .XMAP - XMind 2007/2008 Workbook XMind
259 .XMB - Lucas Arts X-Wing Mission Briefing Format Microsoft
260 .XMC - Lingoes Configuration Lingoes Project
261 .XMCD - PTC Mathcad Worksheet Format Parametric Technology Corporation
262 .XMCDZ - PTC Mathcad Compressed Worksheet Format Parametric Technology Corporation
263 .XMCT - Mathcad Template Format PTC
264 .XMD - GameJack Virtual CD Or DVD Image Format Engelmann Media
265 .XME - GME ISIS / Vanderbilt University / School of Engineering
266 .XMEF - TextMap Evidence Format LexisNexis
267 .XMF - CDRWin Virtual CD Image Format Cal3D
268 .XMG - The Longest Journey XMG Funcom
269 .XMI - Miles Sound System Extended MIDI Files Object Management Group
270 .XMIND - XMind Workbook Format XMind
271 .XMIT - IBM XMIT Data N/A
272 .XML - XML Document Format N/A
273 .XML-PREV - VirtualBox XML Settings Backup Oracle Corporation
274 .XMLA - XML For Analysis Source N/A
275 .XMLJET - Eclipse JET XML Template The Eclipse Foundation
276 .XMLPER - LeCroy Binary Waveform Format N/A
277 .XMLS - Microsoft Excel 2003 XML Microsoft Corporation
278 .XMLX - Excel Spreadsheet Microsoft Corporation
279 .XMM - 3ds Max XML Animation Map Format Autodesk
280 .XMMAP - MindManager XML Map Format Mindjet
281 .XMMAS - MindManager XML Theme Mindjet
282 .XMMAT - MindManager XML Template Mindjet
283 .XMO - Adobe Authorware Movie Driver Adobe Systems Incorporated
284 .XMOD - Datawatch Monarch Model Datawatch Corporation
285 .XMP - Adobe Extensible Metadata Platform Format Adobe Systems
286 .XMPSES - Adobe Premiere Elements Adobe Systems Incorporated
287 .XMPSKIN - XMPlay Skin Un4seen Developments
288 .XMPZ - Miradi XML Project Format Benetech
289 .XMS - Microsoft EXtended Memory Specification Microsoft Corporation
290 .XMT - XMind Workbook Template XMind Ltd.
291 .XMTA - Microsoft Visual Studio XMTA Document Microsoft Corporation
292 .XMV - Microsoft Xbox Video Format Microsoft
293 .XMX - AutoCAD External Message Compiled Autodesk, Inc.
294 .XMZ - Fasttracker 2 Extended Module Format Starbreeze Studios
295 .XN - Cygnus Ld-scripts Red Hat, Inc.
296 .XNB - XNA Game Studio Express XNA Framework Content Pipeline Binary Format Microsoft
297 .XND - ExNode Download Logistical Computing and Internetworking (LoCI) Laboratory
298 .XNF - Extensible Numerical Satinmage
299 .XNK - Microsoft Exchange Shortcut Format N/A
300 .XNODE - LabVIEW National Instruments Corporation
301 .XNP - XnView Addon N/A
302 .XNT - QuarkXPress Extension Format Quark Software
303 .XNV - NVision Layout N/A
304 .XOB - EasyBuilder 8000 Compiled Code Nematron
305 .XOF - RenderMorphics Reality Lab 3D Image Format RenderMorphics
306 .XOJO_BINARY_MENU - Xojo Binary Menu Xojo, Inc.
307 .XOJO_BINARY_PROJECT - Xojo Binary Project Xojo, Inc.
308 .XOJO_BINARY_WINDOW - Xojo Binary Window Xojo, Inc.
309 .XOJO_MENU - Xojo Menu Xojo, Inc.
310 .XOJO_PROJECT - Xojo Programming Project Xojo, Inc.
311 .XOJO_WINDOW - Xojo Window Xojo, Inc.
312 .XOJO_XML_MENU - Xojo XML Menu Xojo, Inc.
313 .XOJO_XML_WINDOW - Xojo XML Window N/A
314 .XOL - Swiss Map Overlay Format swisstopo
315 .XOM - Worms 3D Object Format Team17 Software
316 .XOML - Windows Workflow Format N/A
317 .XOP - IGOR Pro Add-on N/A
318 .XOV - RapidForm XOV 3D Inspection/Model Rapidform, Inc.
319 .XP - WindowBlinds Temporary Format Stardock Corporation
320 .XP0 - SecretPhotos Puzzle Graphic Image N/A
321 .XP2 - XPilot NG XPilot NG
322 .XP3 - KiriKiri Package Format KiriKiri
323 .XP4 - KiriKiri Package KiriKiri
324 .XPAC - Sonic & Sega All-Stars Racing For PC Game Audio Archive Sega Corporation
325 .XPADDERCONTROLLER - Xpadder Controller Layout Format Xpadder
326 .XPADDERPROFILE - Xpadder Settings N/A
327 .XPB - XPB! Basic Source Code Tony D. Jones
328 .XPD - XML Pipeline Document Format N/A
329 .XPDL - XPDL Module Workflow Management Coalition
330 .XPF - XProtector Project Oreans Technologies
331 .XPG - Autoplay Media Studio Exported Page Indigo Rose
332 .XPGT - EPUB XML Stylesheet Page Template Adobe Systems Incorporated
333 .XPI - Firefox Browser Extension Format Mozilla
334 .XPJ - Micro Planner X-Pert Project Format Adobe Systems
335 .XPK - PSpice Library Format Cadence Design Systems, Inc.
336 .XPKU - Apple Mac OS X Universal Binary Package Apple, Inc.
337 .XPL - X-Plane Plug-in Format N/A
338 .XPL2 - TerraExplorerPro LOD Parameter Skyline Software Systems Inc.
339 .XPM - X11 Pixmap Graphic N/A
340 .XPNG - Portable (Public) Network Graphic Bitmap N/A
341 .XPP - X++ Source Code Format Microsoft
342 .XPR - PTC Pro/ENGINEER Part Format Parametric Technology
343 .XPR3 - QuarkXpress 3.0 Mac N/A
344 .XPRJ - Monarch XML Project Datawatch Corporation
345 .XPS - XML Paper Specification Format Microsoft
346 .XPS~ - WindowBlinds Temporary Stardock Corporation
347 .XPT - Mozilla Firefox Component N/A
348 .XPTIN - Xpswmm Hydrology Data XP Solutions Inc.
349 .XPW - Accessible FormNet Fillable Form Intercon Associates Inc.
350 .XPX - Intercon FormNet Intercon Associates Inc.
351 .XPY - MarketBrowser Leading Market Technologies, Inc.
352 .XP~ - WindowBlinds Temporary Stardock Corporation
353 .XQ - XQuery Format The W3C XML Query Working Group
354 .XQL - XML Query Language Format The W3C XML Query Working Group
355 .XQM - XQuery Module The W3C XML Query Working Group
356 .XQT - SuperCalc Macro Spreadsheet Format N/A
357 .XQUERY - XQuery Source Code Format The W3C XML Query Working Group
358 .XQY - XQuery Source Format The W3C XML Query Working Group
359 .XR - Cygnus Ld-scripts Red Hat, Inc.
360 .XRC - WxWidgets WxPython Resource Adobe Systems Incorporated
361 .XRD - Core Wars Data N/A
362 .XRDML - PANalytical XRD Measurement Data XML PANalytical B.V.
363 .XREF - IBM AIX Cross Reference IBM
364 .XRF - WordSearch Cross Reference Format WORDSearch Corporation
365 .XRFF - Extensible Attribute-Relation File Format University of Waikato
366 .XRL - PowerDesigner Report Sybase Inc.
367 .XRM-MS - Microsoft Security Certificate Microsoft
368 .XRNS - Extended Renoise Song Format Renoise
369 .XRP - RationalPlan Format Stand By Soft
370 .XRS - Dig It! Game Pixel Painters Corporation
371 .XRX - Expression Encoder Media Profile Settings Microsoft Corporation
372 .XRY - XRY Data Format Micro Systemation
373 .XS - Age Of Empires 3 Map AI Generator Format Microsoft
374 .XS4 - XESS Worksheet AIS
375 .XS5 - XESS Worksheet AIS
376 .XSB - XACT Sound Bank Microsoft
377 .XSC - Microsoft Visual Studio XSC Format Microsoft
378 .XSD - XML Schema Description Format N/A
379 .XSF - Microsoft Office InfoPath Format Microsoft
380 .XSI - SOFTIMAGE|XSI 3D Model Autodesk
381 .XSIADDON - SOFTIMAGE XSI Add-on Format Autodesk
382 .XSL - XML Stylesheet Format N/A
383 .XSLIC - XenServer License Format Citrix
384 .XSLT - XSL Transform Format N/A
385 .XSM - SimCity Societies Game Electronic Arts, Inc.
386 .XSN - Microsoft Office InfoPath Template Form Format Microsoft
387 .XSO - Expresso Project Ultrapico
388 .XSP - XBMC Smart Playlist Format XBMC
389 .XSPF - XML Shareable Playlist Format N/A
390 .XSQL - Oracle XSQL Servlet Server Side Oracle Corporation
391 .XSR - FabTrol MRP FabTrol Systems
392 .XSS - XML Stylesheet Format Oracle
393 .XSSLOG - Microsoft SharePoint WorkSpace Groove Log Microsoft Corporation
394 .XSSR - Microsoft SharePoint WorkSpace Groove Microsoft Corporation
395 .XST - Microsoft Outlook Personal Folders Format Microsoft
396 .XSTB - TextBridge Nuance Communications, Inc.
397 .XSTK - XStarter Task xStarter Solutions, Inc.
398 .XSU - Fortran 77 Library IBM
399 .XSVF - Xilinx Serial Vector Format Xilinx
400 .XSX - Microsoft Visual Studio XML Schema Layout Format Microsoft
401 .XT - FastTracker Music Track Format N/A
402 .XTC - XTrkCAD Project MartinFischer
403 .XTD - XML Type Definition N/A
404 .XTERME - Winstep Extreme Theme WinStep Software Technologies
405 .XTF - EXtended Triton Format N/A
406 .XTG - QuarkXpress Tags Format Quark, Inc.
407 .XTIC - ActivInspire Ticker Promethean World plc
408 .XTL - Vietcong Game Data Format Pterodon
409 .XTM - CmapTools Exported Topic Map Format IHMC
410 .XTML - XML4web Virtual HTML Document Altairis, s. r. o.
411 .XTMP - Avid Xpress Pro Template Avid Technology, Inc.
412 .XTND - Adobe Acrobat For Mac Plug-In N/A
413 .XTODVD - ConvertXtoDVD Project VSO-Software
414 .XTP - XTreeGold Overlay Autodesk
415 .XTRA - Adobe Director Xtra Adobe Systems Incorporated
416 .XTREME - Winstep Xtreme Theme Pack Format Winstep Software Technologies
417 .XTRL - XTND Translator N/A
418 .XTXT - Xtext The Eclipse Foundation
419 .XUI - Xbox 360 Skin Format Microsoft
420 .XUL - Firefox XML User Interface Language Format Mozilla
421 .XUR - Xbox 360 Compiled Skin Format Microsoft
422 .XV - Khoros Visualization Bitmap Image N/A
423 .XV0 - Lattice XVL Structure Format Lattice Technology
424 .XV2 - V-XVL Geometry Lattice Technology, Inc.
425 .XV3 - P-XVL Geometry Format Lattice Technology
426 .XVA - Citrix Xen Virtual Appliance Format Citrix
427 .XVCT - VISE XML Project Format MindVision Software
428 .XVG - Grace Document Grace Development Team
429 .XVID - XviD Codec Xvid
430 .XVL - EXtensible Virtual World Description Language Document Lattice Technology, Inc.
431 .XVM - VMware Console Configuration Format VMware
432 .XVMCONF - World Of Tanks Configuration Format XVM
433 .XVO - RatDVD Internal RatDVD.CA
434 .XVU - BOClean Database Format Comodo Group, Inc.
435 .XWB - XACT Wave Bank Format Microsoft
436 .XWC - Starbreeze Sound Starbreeze
437 .XWD - X Window Window Screen Dump Or Bitmap N/A
438 .XWF - OmniPage Workflow Format Nuance Communications
439 .XWI - Star Wars: X-Wing Mission LucasArts Entertainment Company, LLC
440 .XWK - Crosstalk Keyboard Mapping Format Intel
441 .XWM - The Elder Scrolls V: Skyrim Music Bethesda Softworks LLC
442 .XWMA - XWMA Audio Compression Format Microsoft Corporation
443 .XWMV - Microsoft Windows Media Microsoft Corporation
444 .XWP - Xerox Writer Document N/A
445 .XWS - Xara Webstyle Format MAGIX
446 .XX - XXEncoded Format N/A
447 .XXD - Brixx Planner Calendar Format Brixx
448 .XXE - XXEncoded Format N/A
449 .XXX - Compucon/Singer PSW Embroidery Design Format Compucon USA
450 .XY - XyWrite Document XyQuest
451 .XY3 - XYWrite III Document N/A
452 .XYP - XY Write III Plus Document N/A
453 .XYS - XYplorer Script Format Donald Lessau
454 .XYW - XYWrite For Windows 3x/4.0 Document N/A
455 .XYZ - Molecule Specification Format N/A
456 .XYZE - Radiance Map N/A
457 .XYZI - 3rdTech Scanner N/A
458 .XYZRGB - 3rdTech XYZ RGB Graphic N/A
459 .XYZV - Celestia Sampled Trajectory Format Celestia Development Team
460 .XZ - XZ Utils Compressed Archive Tukaani
461 .XZFX - ZipLogix ZipForm Format ZipLogix
462 .XZM - Slackware Linux Package Slackware Linux, Inc.
463 .X_B - Parasolid Document Format Siemens PLM Software
464 .X_T - Parasolid File Format Siemens PLM Software