| 21. | .xlt | application/excel ◊ application/vnd.ms-excel ◊ application/x-excel |
| 22. | .xlv | application/excel ◊ application/x-excel |
| 23. | .xlw | application/vnd.ms-excel ◊ application/excel ◊ application/x-excel ◊ application/x-msexcel |
| 24. | .xm | audio/x-mod ◊ audio/xm |
| 25. | .xml | application/xml ◊ text/vnd.IPTC.NITF ◊ text/vnd.IPTC.NewsML ◊ text/vnd.wap.si ◊ text/vnd.wap.sl ◊ text/vnd.wap.wml ◊ text/xml |
| 26. | .xmz | audio/x-mod ◊ xgl/movie |
| 27. | .x-png | image/png |
| 28. | .xpix | application/x-vnd.ls-xpix |
| 29. | .xpm | image/x-xpixmap ◊ image/x-xpm ◊ image/xpm |
| 30. | .xpr | application/vnd.is-xpr |
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