.mscx file: how to open it on Windows

2 Windows apps register the .mscx extension. Install one of them to open the file with a double-click.

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  MuseScore

  Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore.

  Open source 4.7.5.260831071 507.8K ↓ ★ 15.3K
• 
  MuseScore 3

  Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore.

  Open source 3.6.2.548021803 ★ 15.3K

Related guide: Change the default app for a file type in Windows