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It uses System.Windows.Forms and friends. It is a Windows app.

It has like 50 lines of code that are actually platform dependent, from what I can see.

Should be straightforward to port to GTK# or Eto.Forms or something, if one had the inclination.

While I'm a novice - Looking at this, it doesn't appear to require any porting.

winforms on mono never really worked, and hasn't been updated in about 12 years https://github.com/mono/winforms