Another method is to use the Windows 8.3 versions of the file names i.e. something like

D:\_MP3\CLASSI~1\Compos~1\Beetho~1\Beetho~1\Beetho~1\Beethoven, Ludwig van - Beethoven Piano Sonatas - 05 - Beethoven-Sonata in C Minor Op 111 1st Mvt. (Maestoso Allegro con brio ed appassionato).mp3

You don't need to abbreviate everyone if you're only a few chars over. "dir /x" from a command prompt will give you the short versions since they won't always be ~1

Yes. Freakin' annoying. Programs will generally work if you are in the directory, but you can't access the full path. I have issues all the time on our server with this problem and my rsync backup.