No. Rename the .tmp (temporary file) to GP05 Scoring Guitars 2.xml or Scoring Guitars 2.xml, I reckon.

This .tmp file otherwise reads as a .xml file, doesn't it?
I'm not sure why it's happening; I have encountered it before, so I know that this method works; I don't think it means that Service Centre is locked, but equally I don't know why it's happening.

 

You probably replied to my post before I edited it, but you just described exactly what I did (I renamed it the same as the .nicnt file) and it totally worked. I have no idea why it's doing this, either, except that I just migrated to a newer MBP (still on Sierra). Interestingly, not all of my libraries have .xml files and seem to still be loading into v5.6.6 and v6.0.4 without any problem. Once again, thank you for all your help today!

 

My mantra:
if 5.6.6 crashes, try 5.6.0

 

Yes, but the situ that Iggy has will always crash any standalone 'loader' anyway. But it will still create the file.
In fact, 5.6.0 is the worst for it, in this case.