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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .XEP | X-Genics Limited | Graphic Files | eManager File Packaging Information | X-Genics eManager | X-Genics Limited |
| .XESC | Microsoft Corporation | Graphic Files | Microsoft Expression Encoder Screen Capture Data | Microsoft Windows Media Player | Microsoft Corporation |
| .XIE | Microsoft Corporation | Graphic Files | X Image Extension | X Window System | X.Org Foundation |
| .XOT | Xenetech | Graphic Files | Xnetech Job Output File | Xenetech Graphic Workstation | Xenetech |
| .XPS | Microsoft Corporation | Graphic Files | Microsoft XPS (XML Paper Specification) File | Nuance Power PDF Professional | Nuance |
| .XRL | SAP | Graphic Files | PowerDesigner Report File | Sybase PowerDesigner | SAP |
| .XSS | Oracle Corporation | Graphic Files | XML Style Sheet | Microsoft Visual Studio | Microsoft Corporation |
| .XXG | Brixx Software | Graphic Files | Brixx Planner Graph File | Brixx | Brixx Software |
| .XXX | BloodDolly | Graphic Files | TeslaCrypt 3.0 Ransomware Encrypted File | Tesla Decoder | BloodDolly |
| .XYD | Coopware | Graphic Files | XYPad Drawing Document File | XYPad | Coopware |
| .XYZ | SourceForge | Graphic Files | Molecule Specification File | Avogadro | Open Source |
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