.X-PNG | The Pixelmator Team | Arquivos de imagem Raster | Portable Network Graphics | Apple Safari | Apple |
.XBL | Open Source | Arquivos de desenvolvedor | XBLite Source Code File | Apple Safari | Apple |
.XCAPPDATA | Apple | Arquivos de desenvolvedor | Xcode App Data File | Apple Xcode | Apple |
.XCARCHIVE | Apple | Arquivos de desenvolvedor | Xcode Archive | Apple Xcode | Apple |
.XCCRASHPOINT | Apple | Arquivos de desenvolvedor | Xcode Crash Point File | Apple Xcode | Apple |
.XCODE | Apple | Arquivos de desenvolvedor | Xcode Project | Apple Xcode | Apple |
.XCODEPROJ | Apple | Arquivos de desenvolvedor | Xcode Project | Apple Xcode | Apple |
.XCPLUGIN | Apple | Arquivos de complementos | Xcode Plugin | Apple Xcode | Apple |
.XCSCHEME | Apple | Arquivos de desenvolvedor | Xcode Scheme File | Apple Xcode | Apple |
.XCUSERSTATE | Apple | Arquivos Temporários | Xcode Data | Apple Xcode | Apple |
.XCWORKSPACE | Apple | Arquivos de desenvolvedor | Xcode Workspace File | Apple Xcode | Apple |
.XFB | Apple | Arquivos de sistema | Xserve RAID Firmware Binary File | Apple Xserve RAID Admin | Apple |
.XHTM | Opera Software | Arquivos Web | Extensible Hypertext Markup Language Document | Apple Safari | Apple |
.XHTML | Opera Software | Arquivos Web | Extensible Hypertext Markup Language Document | Apple Safari | Apple |
.XIB | Apple | Arquivos de desenvolvedor | Interface Builder File | Apple Interface Builder | Apple |
.XIP | Apple | Arquivos comprimidos | MacOS Signed Archive | Apple Archive Utility | Apple |
.XLF | Open Source | Arquivos de dados | XLIFF Document | Apple TextEdit | Apple |
.XLS | Microsoft Corporation | Arquivos de planilha | Microsoft Excel 97 To 2003 Spreadsheet | iWork | Apple |
.XLSX | Microsoft Corporation | Arquivos de planilha | Microsoft Excel Open XML Spreadsheet | iWork | Apple |
.XMAS | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
.XSEND | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
.XVID | DivX, LLC. | Arquivos de vídeo | Xvid-Encoded Video File | Apple QuickTime Player | Apple |
.XXXX | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |