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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .X-PNG | The Pixelmator Team | Raster Image Files | Portable Network Graphics | Apple Safari | Apple |
| .XBL | Open Source | Developer Files | XBLite Source Code File | Apple Safari | Apple |
| .XCAPPDATA | Apple | Developer Files | Xcode App Data File | Apple Xcode | Apple |
| .XCARCHIVE | Apple | Developer Files | Xcode Archive | Apple Xcode | Apple |
| .XCCRASHPOINT | Apple | Developer Files | Xcode Crash Point File | Apple Xcode | Apple |
| .XCODE | Apple | Developer Files | Xcode Project | Apple Xcode | Apple |
| .XCODEPROJ | Apple | Developer Files | Xcode Project | Apple Xcode | Apple |
| .XCPLUGIN | Apple | Plugin Files | Xcode Plugin | Apple Xcode | Apple |
| .XCSCHEME | Apple | Developer Files | Xcode Scheme File | Apple Xcode | Apple |
| .XCUSERSTATE | Apple | Temporary Files | Xcode Data | Apple Xcode | Apple |
| .XCWORKSPACE | Apple | Developer Files | Xcode Workspace File | Apple Xcode | Apple |
| .XFB | Apple | System Files | Xserve RAID Firmware Binary File | Apple Xserve RAID Admin | Apple |
| .XHTM | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Apple Safari | Apple |
| .XHTML | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Apple Safari | Apple |
| .XIB | Apple | Developer Files | Interface Builder File | Apple Interface Builder | Apple |
| .XIP | Apple | Compressed Files | MacOS Signed Archive | Apple Archive Utility | Apple |
| .XLF | Open Source | Data Files | XLIFF Document | Apple TextEdit | Apple |
| .XLS | Microsoft Corporation | Spreadsheet Files | Microsoft Excel 97 To 2003 Spreadsheet | iWork | Apple |
| .XLSX | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Open XML Spreadsheet | iWork | Apple |
| .XMAS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .XSEND | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .XVID | DivX, LLC. | Video Files | Xvid-Encoded Video File | Apple QuickTime Player | Apple |
| .XXXX | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .Y | Microsoft Corporation | Raster Image Files | Subsampled Raw YUV Image | Apple QuickTime Player | Apple |
| .ZIP | Winrar | Compressed Files | Zipped File | Apple Archive Utility | Apple |
| .ZONE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ZPI | Winrar | Compressed Files | Zipped File | Apple Archive Utility | Apple |
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