[Doitsu]

@DiapDealer: Thanks for the code! After some cosmetic changes, it seems to work on all three platforms:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys, os

def run(bk):
    print(sys.path)
    for path in sys.path:
        if "plugin_launchers/python" or "plugin_launchers\\python" in path:
            print(path)
            sys.path.append(os.path.normpath(os.path.join(path, '../../python3lib')))
            print(sys.path)
            break
        
    try:
        import ncxgenerator
        print('python3lib path', os.path.dirname(os.path.abspath(ncxgenerator.__file__)))
    except ImportError:
        print('Can\'t find python3lib')
        
    return 0

def main():
    print('I reached main when I should not have\n')
    return -1

if __name__ == "__main__":
    sys.exit(main())