Music file format conversion possible?

I am trying to figure out if there is someone who can convert a unique version of XML used in the native file format of a certain music program (iPiano) that I use in MacOS X 10.3, to standard MusicXML, assuming that’s the best avenue to take in this venture.  The original program is obsolete, unsupported, and no source code for it is available.  If my Mac dies, so too do all my music files, as they are unplayable in any other program on any other OS.

I’ve enclosed the native music format file (.gme extension) of one of my songs for comparison with a standard MusicXML format file.

I was told by someone from MusicXML (the business; contacted on Facebook) that the only similarity is that it’s a variation of XML, and pointed me to this group, in hopes someone can help.

Jared