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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .X32 | Adobe Systems Incorporated | Plugin Files | Adobe Xtra File | Adobe Director | Adobe Systems Incorporated |
| .XBA | Oracle Corporation | Plugin Files | OpenOffice.org Basic Module File | Apache OpenOffice | Apache Software Foundation |
| .XCPLUGIN | Apple | Plugin Files | Xcode Plugin | Apple Xcode | Apple |
| .XEO | Signwave UK | Plugin Files | Signwave Auto-Illustrator Plugin | Signwave Auto-Illustrator | Signwave UK |
| .XGO | GeoConcept SA | Plugin Files | GeoConcept Add-on | GeoConcept | GeoConcept SA |
| .XLA | Microsoft Corporation | Plugin Files | Excel Add-In File | Microsoft Excel | Microsoft Corporation |
| .XLAM | Microsoft Corporation | Plugin Files | Excel Open XML Macro-Enabled Add-In | Microsoft Excel | Microsoft Corporation |
| .XLL | Microsoft Corporation | Plugin Files | Excel Add-In File | Microsoft Excel | Microsoft Corporation |
| .XLX | Interscape | Plugin Files | XoloX Incomplete Download File | XoloX | Interscape |
| .XMD | Bitdefender | Plugin Files | Bitdefender Plugin File | Bitdefender Total Security 2018 | Bitdefender |
| .XPI | Mozilla | Plugin Files | Mozilla Installer Package | Mozilla Firefox | Mozilla |
| .XPL | Interscape | Plugin Files | LcdStudio Playlist File | LCDStudio | Interscape |
| .XPT | Mozilla | Plugin Files | Mozilla Firefox Component | Mozilla Firefox | Mozilla |
| .XRS | RealNetworks | Plugin Files | Real Player External Resource | RealPlayer | Realtime Technologies |
| .XYZ | SourceForge | Plugin Files | Molecule Specification File | Avogadro | Open Source |
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