can't build on Windows

[dansmith65]

PathFMToOS CF fails, producing an OS path like:

C:\C:\generator-master\dist\

From the FM Path:

file:/C:/generator-master/dist/

[cristoslc]

In addition to the error in #1 (comment), even if the path is corrected manually, there is another failure when it tries to save a copy to disk.

• Repro steps: https://youtu.be/_jndUgksip0 (30 seconds)
  • I neglected to re-open the data viewer in the video, but the $path to which it was trying to save the file was file:/D:/Users/clianide/Downloads/generator-master/dist//Generator.fmp12. Removing the double // (resulting in $path = file:/D:/Users/clianide/Downloads/generator-master/dist/Generator.fmp12) did not resolve the issue.

[toddgeist]

I don't have a windows machine. Could you fix it, and attach the fixed file here?