OpenType files contain a good deal of information that is specific to the Mac and PC platform. This program only adjusts the PC data. I don't use Macs. Thus any Mac-specific code would be untested. I prefer not to do something than to do it and have it not work.
OpenType files have the ability to define font names in multiple languages.
The fonts I've tried don't do this. The code for renaming the font will almost certainly not work properly for fonts that use multiple languages for their names.