| XAML | Developer | 301 | pagegalleryviewstyles.xaml |
| XAP | Executable Application | 88 | PowerViewRes.ko.xap |
| XBAP | Executable Application | 4 | XamlViewer_v0300.xbap |
| XBF | Developer | 369 | RadioButtonStyle.xbf |
| XDR | Settings | 18 | locations.xdr |
| XIN | Developer | 4 | rblayout.xin |
| XLA | Plugin | 33 | ATPVBAEN.XLA |
| XLAM | Plugin | 16 | FUNCRES.XLAM |
| XLL | Dynamic Link Library | 6 | ANALYS32.XLL |
| XLS | Spreadsheet | 31 | EXCEL9.XLS |
| XLSX | Spreadsheet | 4 | EXCEL12.XLSX |
| XLT | Data | 14 | Balance Sheet.xlt |
| XLTX | Spreadsheet | 32 | SalesReport.xltx |
| XML | Data | 4291 | Microsoft.PPIProjection_10.0.15063.0_neutral_neutral_cw5n1h2txyewy.xml |
| XPB | Developer | 38 | XBA55P_A.XPB |
| XRM-MS | System | 695 | SLC-Component-SKU-OCUR-ppdlic.xrm-ms |
| XSD | Developer | 449 | hotspotprofile_v1.xsd |
| XSL | Data | 225 | xml.xsl |
| XSLT | Data | 5 | gatherWirelessInfo.xslt |
| XSN | Page Layout | 92 | Groove Starter Template.xsn |
| XSS | Internet Web | 8 | Installed_schemas15.xss |
| XST | Settings | 5 | xrwcxst0.xst |
| XSX | Developer | 3 | Maml.xsx |
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