Thanks for the clarification.
I had just assumed the \\ would use whatever default seperator, be it "/" or NULL based on 2.3 or 2.4 tags, etc.
I am fully aware of the AC/DC issues as I'm just setting off to retag my library to remove all the junk off the artist tags (vs, featuring, etc). It was this how I noticed the NULLs as I use XBMC Media Center with library functions and they use (space)(forwardslash)(space) as the seperator.
Thanks again for this great program, I've been using it for as long as i can remember.
Keep up the excellent work.