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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .XAR | Magix Software GmbH | Compressed Files | Xara Xtreme Drawing | Xara Designer Pro X | Magix Software GmbH |
| .XCP | Advanced Systems Concepts, Inc. | Compressed Files | XLNT Script Command | XLNT | Advanced Systems Concepts, Inc. |
| .XCZ | DynaSend | Compressed Files | BuzzLetter Encrypted Stationery Templates | BuzzLetter | DynaSend |
| .XDELTA | Open Source | Compressed Files | Xdelta Binary Differential File | xdelta | Open Source |
| .XEZ | X-Genics Limited | Compressed Files | X-Genics EManager Template Package | X-Genics eManager | X-Genics Limited |
| .XIP | Apple | Compressed Files | MacOS Signed Archive | Apple Archive Utility | Apple |
| .XTR | SourceForge | Compressed Files | XTrkCad Demo File | XTrackCAD | SourceForge |
| .XX | Unknown Developer | Compressed Files | XXEncoded File | Corel WinZip 21 | Corel |
| .XXE | Unknown Developer | Compressed Files | XXEncoded File | Corel WinZip 21 | Corel |
| .XXL | Unknown Developer | Compressed Files | File Archive Handler Compressed Archive | File Archive Handler | Unknown Developer |
| .XZ | Various Developers | Compressed Files | XZ Compressed Archive | 7-Zip | Igor Pavlov |
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