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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .XSLT | Syncro Soft | Data Files | XSL Transformation File | Microsoft Notepad | Microsoft Corporation |
| .XSR | Bentley Systems | Data Files | Bentley GEOPAK XS List Report | GEOPAK Civil Engineering Suite | Bentley Systems |
| .XSW | Milinta | Data Files | Milinta APL Transfer Function File | Milinta APL | Milinta |
| .XTE | PerkinElmer | Data Files | LabChip XTe Data | Unknown Software | Unknown Developer |
| .XTG | Ben Stöver | Data Files | Extensible TreeGraph File | TreeGraph | Ben Stöver |
| .XTM | Institute for Human and Machine Cognition (IHMC) | Data Files | CmapTools Exported Topic Map | IHMC CmapTools | Institute for Human and Machine Cognition (IHMC) |
| .XTP | adnx | Data Files | xTime Project Document | xPlan | adnx |
| .XTP2 | Microsoft Corporation | Data Files | Microsoft InfoPath Template | Microsoft InfoPath | Microsoft Corporation |
| .XTS | The U.S. Census Bureau | Data Files | Integrated Microcomputer Processing System (IMPS) Data File | IMPS | The U.S. Census Bureau |
| .XVO | Open Source | Data Files | RatDVD Internal File | RatDVD | Open Source |
| .XVU | Comodo Group | Data Files | BOClean Database File | BOClean | Comodo Group |
| .XWF | Nuance | Data Files | OmniPage Workflow File | OmniPage | Nuance |
| .XWZ | Major Geeks | Data Files | X-Setup Pro Data File | X-Setup Pro | Major Geeks |
| .XXA | Brixx Software | Data Files | Account Detail Chart File | Brixx | Brixx Software |
| .XXC | CentraLine | Data Files | Centraline COACH Controller Firmware | Unknown Software | Unknown Developer |
| .XXD | Brixx Software | Data Files | Brixx Planner Calendar | Brixx | Brixx Software |
| .XXP | Brixx Software | Data Files | Plan File | Brixx | Brixx Software |
| .XXXX | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .XYT | Casa Software Ltd | Data Files | PSU Bio Time-of-Flight Data | CasaXPS | Casa Software Ltd |
| .XYZ | SourceForge | Data Files | Molecule Specification File | Avogadro | Open Source |
| .XZP | Unknown Developer | Data Files | XZP Container Format | Unknown Software | Unknown Developer |
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