| X | DirectX Model File | 3D Image Files | 2 | 2 |
| X-PNG | Portable Network Graphics | Raster Image Files | 18 | 1 |
| X01 | Corel Paradox Secondary Index | Data Files | 3 | 1 |
| X02 | Corel Paradox Secondary Index |
Data Files
| 3 | 1 |
| X05 | Corel Paradox Secondary Index |
Data Files
| 3 | 1 |
| X06 | Corel Paradox Secondary Index |
Data Files
| 3 | 1 |
| X09 | Corel Paradox Secondary Index |
Data Files
| 3 | 1 |
| X1 | X1 Desktop Search Saved Search Data |
Data Files
| 1 | 1 |
| X10 | X Window Bitmap Dump File |
Raster Image Files
| 1 | 1 |
| X11 | X Windows System Bitmap Image |
Raster Image Files
| 1 | 1 |
| X13 | Hooligans Game Archive File | Game Files | 1 | 1 |
| X16 | Macromedia Extra Document |
Data Files
| 4 | 1 |
| X1D | Vicon Unprocessed Data |
Data Files
| 1 | 1 |
| X1S | X1 Desktop Search Saved Search Data |
Data Files
| 1 | 1 |
| X1Z | X1 Saved Search Archive |
Data Files
| 1 | 1 |
| X23 | Uncommon File Extension | Uncommon Files | 1 | 1 |
| X2M | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| X32 | Adobe Xtra File | Plugin Files | 3 | 1 |
| X33 | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| X3D | Compiled Vertex Shader File |
3D Image Files
| 2 | 2 |
| X3DB | X3D Binary Format |
3D Image Files
| 2 | 2 |
| X3F | SIGMA X3F Camera RAW File | Camera Raw Files | 4 | 1 |
| X3M | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| X3V | Yamaha Motif Audio | Audio Files | 1 | 1 |
| X5 | Rockwell Software Logix 5 File |
Data Files
| 1 | 1 |
| X50 | XTreeGold Help Data |
Data Files
| 1 | 1 |
| X64 | Commodore 64 Disk Image | Disk Image Files | 5 | 1 |
| XA | The Sims Audio File |
Audio Files
| 7 | 3 |
| XA2 | XWE Data File |
Game Files
| 1 | 1 |
| XAC | SimCity Societies Game File |
Game Files
| 3 | 3 |
| XACT | XactScript File |
Uncommon Files
| 1 | 1 |
| XAD | eXotic ADlib Sound Format File |
Audio Files
| 1 | 1 |
| XAF | 3ds Max XML Animation File |
3D Image Files
| 4 | 2 |
| XAK | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| XAML | Extensible Application Markup Language | Developer Files | 3 | 1 |
| XAMLX | Microsoft Visual Studio XAMLX Document | Text Files | 2 | 1 |
| XAN | Worms Map File |
Game Files
| 2 | 1 |
| XAP | XACT Project |
Developer Files
| 2 | 2 |
| XAR | Xara Xtreme Drawing | Vector Image Files | 5 | 3 |
| XAS | PTC Pro/Engineer Assembly File | CAD Files | 2 | 2 |
| XBA | OpenOffice.org Basic Module File |
Plugin Files
| 1 | 1 |
| XBAP | XAML Browser Application File | Executable Files | 3 | 1 |
| XBC | SMART Notebook File |
Data Files
| 4 | 1 |
| XBD | DocuWorks Binder File |
Data Files
| 5 | 3 |
| XBEL | XBEL Bookmarks File | Web Files | 2 | 1 |
| XBF | XAML Binary File |
Developer Files
| 1 | 1 |
| XBIN | RegSupreme License Data |
Data Files
| 1 | 1 |
| XBK | SMART Notebook File |
Data Files
| 5 | 2 |
| XBL | XBLite Source Code File |
Developer Files
| 3 | 2 |
| XBM | X11 Bitmap Graphic |
Raster Image Files
| 5 | 1 |
| XBS | XnView Script |
Developer Files
| 1 | 1 |
| XBT | SMART Notebook Template File |
Data Files
| 1 | 1 |
| XBX | Xbox Icon Or Picture |
Raster Image Files
| 1 | 1 |
| XB~ | IC File |
Uncommon Files
| 1 | 1 |
| XC | Plain Text Source-code File |
Text Files
| 1 | 1 |
| XC2 | DACCS Configuration File | Settings Files | 1 | 1 |
| XCAPPDATA | Xcode App Data File |
Developer Files
| 1 | 1 |
| XCARCHIVE | Xcode Archive |
Developer Files
| 1 | 1 |
| XCCRASHPOINT | Xcode Crash Point File |
Developer Files
| 1 | 1 |
| XCD | WarpIN Data File |
Data Files
| 1 | 1 |
| XCEL | Microsoft Excel For Mac Spreadsheet | Spreadsheet Files | 1 | 1 |
| XCF | GIMP Image File |
Raster Image Files
| 4 | 1 |
| XCH | LinkAssistant Project |
Data Files
| 1 | 1 |
| XCI | Adobe Reader Font Mapping File |
Settings Files
| 1 | 1 |
| XCK | Extended Crack File |
Data Files
| 1 | 1 |
| XCL | XTree For Windows Script |
Developer Files
| 1 | 1 |
| XCM | CmapTools Exported Concept Map | GIS Files | 1 | 1 |
| XCMD | HyperCard External Commands |
Developer Files
| 1 | 1 |
| XCN | GenePattern XCN Data File |
Data Files
| 1 | 1 |
| XCO | Xilinx CORE Generator Log |
Data Files
| 1 | 1 |
| XCODE | Xcode Project |
Developer Files
| 1 | 1 |
| XCODEPROJ | Xcode Project |
Developer Files
| 1 | 1 |
| XCP | XLNT Script Command |
Text Files
| 2 | 2 |
| XCPLUGIN | Xcode Plugin |
Plugin Files
| 1 | 1 |
| XCR | Warlords Battlecry Game File |
Game Files
| 1 | 1 |
| XCS | BuzzLetter Encrypted Stationery Template | Encrypted Files | 1 | 1 |
| XCSCHEME | Xcode Scheme File |
Developer Files
| 1 | 1 |
| XCU | OpenOffice.org Configuration File |
Settings Files
| 1 | 1 |
| XCUSERSTATE | Xcode Data | Temporary Files | 1 | 1 |
| XCWORKSPACE | Xcode Workspace File |
Developer Files
| 1 | 1 |
| XCZ | BuzzLetter Encrypted Stationery Templates | Compressed Files | 1 | 1 |
| XD | CCS-lib.2 Examples Motif-CC File |
Data Files
| 1 | 1 |
| XDB | Symantec Virus Database File |
Data Files
| 2 | 2 |
| XDC | Adobe Acrobat Printer Description |
Settings Files
| 3 | 2 |
| XDE | Tgif-3.0 File |
3D Image Files
| 1 | 1 |
| XDELTA | Xdelta Binary Differential File |
Compressed Files
| 1 | 1 |
| XDF | Extended Disk Format Image |
Disk Image Files
| 3 | 3 |
| XDI | WinArchiver Extended Disk Image File |
Disk Image Files
| 1 | 1 |
| XDK | XML Development Kit Project |
3D Image Files
| 1 | 1 |
| XDP | XML Data Package |
Data Files
| 3 | 2 |
| XDR | XML-Data Reduced File |
Settings Files
| 4 | 1 |
| XDR_TOR | Insight II Binary Torsion File |
Data Files
| 1 | 1 |
| XDS | DS Game Maker Project File |
Game Files
| 3 | 3 |
| XDSL | D-link Router UK Firmware Update File | System Files | 1 | 1 |
| XDT | Win-Test Extra Data |
Data Files
| 2 | 2 |
| XDW | Fuji Xerox DocuWorks File | Page Layout Files | 2 | 1 |
| XEA | Encrypted Archive File |
Encrypted Files
| 1 | 1 |
| XEB | Apabi eBook File | eBook Files | 1 | 1 |
| XED | XED Chemical Modeler Input/Output Data |
Data Files
| 1 | 1 |
| XEE | Microsoft Expression Encoder Preset |
Settings Files
| 1 | 1 |
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