Windows has a maximum file path length of about 255 characters (assorted sub directories+filename), normally that's not really an issue. But when you're using a library set up like:
I:Music\Various Artists and Genres\Electronic\Jungle_Drum and Bass\Record Labels\...
then files quickly become unplayable when your internet-friends provide music that has long information used multiple times in their sub directories (like label, release#, date, artist or album).
It would be useful for sorting/editing if there was a column where we could see the amount of characters used so we'd know if directories need to be renamed.