The File Extensions Database


  • Developer by: Microsoft
  • Category: Font Files
  • Format: XML

What is an .COMPOSITEFONT file?

.COMPOSITEFONT is Windows Composite Font File

XML file used by Windows applications to display different fonts; contains definitions of font families and includes each font family's name, weight, style, underlining, and strikethrough setting; can be used to build multilingual fonts or to provide a fallback mechanism for specific characters that are missing on the system.

COMPOSITEFONT files replace the Win32 mechanisms that were used to solve the problems of multilingual fonts, font fallback, font binding, font association, and end-user-defined characters (EUDC). Composite fonts can be accessed using the FontFamily and Typeface portions of the System.Windows.Media Windows Presentation Foundation (WPF) API.

Composite font files can be created using a Windows software development IDE such as Microsoft Visual Studio. They can also be edited with a text editor since they are stored in an XML text format.

Programs that open Windows Composite Font File
Microsoft Visual Studio 2017
Microsoft XML Notepad

How to solve problems with COMPOSITEFONT files

  • Associate the COMPOSITEFONT file extension with the correct application. On :
    Windows: Right click on any COMPOSITEFONT file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.COMPOSITEFONT files". Mac: Right click (or Ctrl-click) the COMPOSITEFONT file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .COMPOSITEFONT is Windows Composite Font File. Because only the current version supports the latest COMPOSITEFONT file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .COMPOSITEFONT is Windows Composite Font File update.
  • To make sure that your COMPOSITEFONT file is not corrupted or virus-infected, get the file again and scan it with antivirus software.