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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .X23 | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .X2M | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .X33 | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .X3M | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .XACT | XactSystems | Uncommon Files | XactScript File | Unknown Software | Unknown Developer |
| .XAK | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .XB~ | Unknown Developer | Uncommon Files | IC File | Unknown Software | Unknown Developer |
| .XGA | Piotr Fusik | Uncommon Files | Atari Falcon Picture Image Format | Recoil | Piotr Fusik |
| .XGC | id Software | Uncommon Files | GtkRadiant XML Game Config | GtkRadiant | id Software |
| .XHD | Open Source | Uncommon Files | HappyFish XML Data File | HappyFish | Open Source |
| .XI1 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .XLAT | DigiSoft Innovations | Uncommon Files | An Unknown Apple II File | Golden Orchard | DigiSoft Innovations |
| .XLTD | Unknown Developer | Uncommon Files | Thunder Temporary Data File | Unknown Software | Unknown Developer |
| .XLX | Interscape | Uncommon Files | XoloX Incomplete Download File | XoloX | Interscape |
| .XMP | Adobe Systems Incorporated | Uncommon Files | Extensible Metadata Platform File | Microsoft Notepad | Microsoft Corporation |
| .XNK | Microsoft Corporation | Uncommon Files | Microsoft Exchange Public Folder Shortcut | Microsoft Exchange Server | Microsoft Corporation |
| .XNX | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .XPE | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .XPN | Quest Software | Uncommon Files | Quest Saved Explain Plan | Unknown Software | Unknown Developer |
| .XPR | Parametric Technology Corporation | Uncommon Files | Pro/ENGINEER Part Instance Accelerator File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .XT* | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .XUP | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .XUW | Milinta | Uncommon Files | Milnta APL Transfer Function | Milinta APL | Milinta |
| .XVID-TRL | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .XWF | Nuance | Uncommon Files | OmniPage Workflow File | OmniPage | Nuance |
| .XWT | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .XXX | BloodDolly | Uncommon Files | TeslaCrypt 3.0 Ransomware Encrypted File | Tesla Decoder | BloodDolly |
| .XXZ | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
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