That reminds me, I 'think' I read somewhere where WMP can be a touch sensitive to file name changing. I've searched the forum, but so far to no avail. I'll see if I can remember to get back to this thread. My answer is incomplete for now.

U might not want to have oodles of apps but to consider some other options: look at the links in this following thread. Perhaps another option is music match & u can try out the free version 1st. I heard it's only limited by speed.