File extensions starting with X

#	Extension	Developer	File Type
1	X	Microsoft	DirectX Model Format
2	X01	Corel Corporation	Corel Paradox Secondary Index
3	X02	Corel Corporation	Corel Paradox Secondary Index
4	X03	Corel Corporation	Corel Paradox Secondary Index
5	X04	Corel Corporation	Corel Paradox Secondary Index

6	X05	Corel Corporation	Corel Paradox Secondary Index
7	X06	Corel Corporation	Corel Paradox Secondary Index
8	X07	Corel Corporation	Corel Paradox Secondary Index
9	X08	Corel Corporation	Corel Paradox Secondary Index
10	X09	Corel Corporation	Corel Paradox Secondary Index
11	X11	X Foundation	X Window System Bitmap Image
12	X13	Darxabre	Hooligans Game Archive
13	X16	N/A	Macromedia extra document
14	X32	Adobe Systems	Adobe Xtra Format
15	X3D	MAGIX	Xara3D Project
16	X3DV	Web3D Consortium	Web3D X3D Graphics Image
17	X3F	SIGMA	SIGMA X3F Camera RAW Format
18	X86	N/A	Linux Executable File
19	XA	Electronic Arts	The Sims Audio Format
20	XAA	N/A	XML audit data
21	XAB	Microsoft Corporation	Microsoft Outlook Express Address Book
22	XAML	Microsoft	Windows Markup Format
23	XAMLX	Microsoft	XAMLX Document Format
24	XAN	Team17 Software	Worms Map Format
25	XAP	Microsoft	Silverlight Application Package
26	XAPK	N/A	Compressed Android Package
27	XAR	MAGIX	Xara Xtreme Drawing
28	XAS	Parametric Technology	Pro/ENGINEER Assembly Instance Accelerator Format
29	XBAP	Microsoft	Microsoft Silverlight Application Package
30	XBM	N/A	X11 Bitmap Graphic
31	XBRL	XBRL International	Extensible Business Reporting Language
32	XBS	N/A	XnConvert configuration
33	XBX	Microsoft Corporation	Xbox Icon Or Picture
34	XCCONFIG	Apple, Inc.	Apple Xcode Configuration Settings
35	XCEL	Microsoft Corporation	Microsoft Excel For Mac Spreadsheet
36	XCF	GIMP	GIMP Image Format
37	XCODEPROJ	Apple	Xcode Project
38	XCR	Enlight Software. Ltd.	Warlords Battlecry Game
39	XDC	TOTALCMD	Total Commander With DarkCrypt IV Plug-in Encrypted
40	XDP	Adobe Systems	XML Data Package
41	XDU	N/A	Backdoor.Win32.PcClient.xdu
42	XDXF	N/A	XML Dictionary eXchange Format
43	XEJ	Microsoft	Expression Encoder Job Format
44	XEL	Microsoft	Expression Encoder Live Encoding Format
45	XESC	Microsoft	Expression Encoder Screen Capture Format
46	XEVGENXML	Adobe Systems Incorporated	Adobe Dreamweaver
47	XFD	UWI	XFD Format
48	XFDF	Adobe Systems	Adobe Acrobat XFDF Format
49	XFDL	UWI	XFDL Format
50	XFL	Adobe Systems	Flash Movie Archive
51	XFO	N/A	XSL-FO Formatted Form
52	XFP	Microsoft Corporation	Microsoft SharePoint Extending Form Library Properties
53	XG0	Corel Corporation	Corel Paradox Secondary Index
54	XG1	Corel Corporation	Corel Paradox Secondary Index
55	XG2	Corel Corporation	Corel Paradox Secondary Index
56	XG3	Corel Corporation	Corel Paradox Secondary Index
57	XG4	Corel Corporation	Corel Paradox Secondary Index
58	XG5	Corel Corporation	Corel Paradox Secondary Index
59	XGL	N/A	XGL 3D CAD Model
60	XGMML	N/A	XGMML Graph Format
61	XHB	N/A	HomeBank Data
62	XHT	N/A	XHTML Format
63	XHTM	N/A	Extensible Hypertext Markup Language Document
64	XHTML	N/A	Extensible Hypertext Markup Language Format
65	XIB	Apple	Interface Builder Format
66	XIF	Nuance Communications	ScanSoft Pagis Format
67	XIG	N/A	XML Instance Generator
68	XIMG	N/A	Extended GEM bitmap
69	XJB	Oracle Corporation	OEPE JAXB Wizard Bindings
70	XL	Microsoft	Excel Spreadsheet
71	XLA	Microsoft	Excel Add-In Format
72	XLA5	Microsoft Corporation	Microsoft Excel 5 For Mac Add-in
73	XLA8	Microsoft Corporation	Microsoft Excel 98 For Mac Add-in
74	XLAM	Microsoft	Excel Open XML Macro-Enabled Add-In
75	XLA_	Microsoft Corporation	Microsoft Excel 4 For Mac Add-in
76	XLB	Microsoft	Excel Toolbars Format
77	XLB4	Microsoft Corporation	Microsoft Excel 4 For Mac Toolbars
78	XLB5	Microsoft Corporation	Microsoft Excel 5 For Mac Toolbars
79	XLB8	Microsoft Corporation	Microsoft Excel 98 For Mac Toolbars
80	XLBN	Microsoft Corporation	Microsoft Excel 1 For Mac Toolbars
81	XLC	Microsoft	Excel Chart
82	XLC3	Microsoft Corporation	Microsoft Excel 3 For Mac Chart
83	XLC4	Microsoft Corporation	Microsoft Excel 4 For Mac Chart
84	XLC_	Microsoft Corporation	Microsoft Excel 2 For Mac Chart
85	XLD	Microsoft	Excel Database Format
86	XLF	OASIS	XLIFF Document
87	XLK	Microsoft	Excel Backup Format
88	XLKF	N/A	ABB license key
89	XLL	Microsoft	Excel Add-In Format
90	XLL_	Microsoft Corporation	Microsoft Excel 4 For Mac Add-in
91	XLM	Microsoft	Excel Macro
92	XLM3	Microsoft Corporation	Microsoft Excel 3 For Mac Macro
93	XLM4	Microsoft Corporation	Microsoft Excel 4 For Mac Macro
94	XLM_	Microsoft Corporation	Microsoft Excel 2 For Mac Macro
95	XLOG	Tencent	WeChat Log File
96	XLPF	Microsoft Corporation	Microsoft Excel For Mac Setting
97	XLR	Microsoft	Works Spreadsheet
98	XLS	Microsoft	Excel Spreadsheet
99	XLS3	Microsoft Corporation	Microsoft Excel 3 For Mac Spreadsheet
100	XLS4	Microsoft Corporation	Microsoft Excel 4 For Mac Spreadsheet
101	XLS5	Microsoft Corporation	Microsoft Excel 5 For Mac Spreadsheet
102	XLS8	Microsoft Corporation	Microsoft Excel 98 For Mac Spreadsheet
103	XLSB	Microsoft	Excel Binary Spreadsheet
104	XLSHTML	Microsoft	Microsoft Excel HTML Spreadsheet
105	XLSM	Microsoft	Excel Open XML Macro-Enabled Spreadsheet
106	XLSMHTML	Microsoft	Microsoft Excel MIME HTML Spreadsheet
107	XLSX	Microsoft	Microsoft Excel Open XML Spreadsheet
108	XLS_	Microsoft Corporation	Microsoft Excel For Mac Spreadsheet
109	XLT	Microsoft	Excel Template
110	XLTHTML	Microsoft	Microsoft Excel HTML Spreadsheet Template
111	XLTM	Microsoft	Excel Open XML Macro-Enabled Spreadsheet Template
112	XLTX	Microsoft	Excel Open XML Spreadsheet Template
113	XLV	Microsoft	Excel Visual Basic Module
114	XLW	Microsoft	Excel Workspace Format
115	XLW4	Microsoft Corporation	Microsoft Excel 4 For Mac Workbook
116	XLW5	Microsoft Corporation	Microsoft Excel 5 For Mac Workbook
117	XLW_	Microsoft Corporation	Microsoft Excel 2 For Mac Workbook
118	XLXML	Microsoft Corporation	Microsoft Excel XML Worksheet
119	XM	Fasttracker	Fasttracker 2 Extended Module
120	XMAP	XMind	XMind 2007/2008 Workbook
121	XMD	Engelmann Media	Extended Media Disc Image
122	XMI	Object Management Group	XML Metadata Interchange Format
123	XMIND	XMind	XMind Workbook Format
124	XML	World Wide Web Consortium	XML Format
125	XML-LOG	N/A	XML log
126	XMLA	N/A	XML For Analysis Source
127	XMLS	Microsoft Corporation	Microsoft Excel 2003 XML
128	XMLX	Microsoft Corporation	Excel Spreadsheet
129	XMMAP	Mindjet	MindManager XML Map Format
130	XMP	Adobe Systems	Extensible Metadata Platform Format
131	XMT_BIN	N/A	Generic
132	XMT_NEU	N/A	Parasolid CAD format
133	XMT_TXT	N/A	Generic
134	XOL	swisstopo	Swiss Map Overlay
135	XOML	N/A	Windows Workflow Format
136	XOV	Rapidform, Inc.	RapidForm XOV 3D Inspection/Model
137	XPD	Sony	XML Pipeline Document
138	XPDL	Workflow Management Coalition	XPDL Module
139	XPI	Mozilla	Mozilla Installer Package
140	XPKU	Apple, Inc.	Apple Mac OS X Universal Binary Package
141	XPM	N/A	X11 Pixmap Graphic
142	XPR	Parametric Technology	Pro/ENGINEER Part Instance Accelerator Format
143	XPS	Microsoft	XML Paper Specification Format
144	XPT	N/A	Mozilla Firefox Component
145	XRC	Adobe Systems Incorporated	WxWidgets WxPython Resource
146	XRDML	PANalytical B.V.	PANalytical XRD Measurement Data XML
147	XSD	N/A	XML Schema Definition
148	XSF	Microsoft	InfoPath Form Definition Format
149	XSI	Autodesk	Softimage XSI 3D Image
150	XSL	N/A	Microsoft SharePoint WorkSpace Groove Database Format
151	XSLB	N/A	Microsoft Excel data
152	XSLT	N/A	XSL Transformation Format
153	XSN	Microsoft	InfoPath Form Template Format
154	XSPF	N/A	XSPF Playlist Format
155	XSQL	Oracle Corporation	Oracle XSQL Servlet Server Side
156	XSS	Oracle	XML Style Sheet
157	XSSLOG	Microsoft Corporation	Microsoft SharePoint WorkSpace Groove Log
158	XSSR	Microsoft Corporation	Microsoft SharePoint WorkSpace Groove
159	XST	Microsoft	Microsoft Outlook Personal Folders Format
160	XSVF	Xilinx	Xilinx Serial Vector Format
161	XTD	N/A	XML Type Definition
162	XUI	Microsoft	Xbox 360 User Interface Format
163	XUL	Mozilla	XML User Interface Language Format
164	XUR	Microsoft	Xbox 360 Binary User Interface Format
165	XV0	Lattice Technology	Lattice XVL Structure Format
166	XV2	Lattice Technology, Inc.	V-XVL Geometry
167	XV3	Lattice Technology	Lattice XVL Geometry Format
168	XVA	Citrix	XenServer Virtual Appliance Format
169	XVD	Microsoft	Xbox Virtual Disk
170	XVID	Xvid	Xvid-Encoded Video Format
171	XVM	VMware	VMware Console Configuration Format
172	XWC	Starbreeze	Starbreeze Sound
173	XWD	N/A	X Windows Dump Image
174	XWM	Bethesda Softworks LLC	The Elder Scrolls V: Skyrim Music
175	XWMV	Microsoft Corporation	Microsoft Windows Media
176	XXE	N/A	XXEncoded Format
177	XXX	Compucon USA	Compucon Singer Embroidery Format
178	XYZE	N/A	Radiance Map
179	XZ	Tukaani	XZ Compressed Archive
180	X_B	Siemens PLM Software	Parasolid Model Part Format
181	X_N	N/A	Parasolid CAD format
182	X_T	Siemens PLM Software	Parasolid Model Part Format

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