convert-ly is a python script. For Windows, rename the file c:\Program Files (x86)\usr\bin\convert-ly to convert-ly.py
Then Windows will know to run the python interpreter on this file.
NOTE:
This script works as is on Linux because the first line of the script
says to run python on the file. But that's for Linux. Windows doesn't
know about #!/usr/bin/python3.
Dan Connors