Since using Radio UserLand on my PC with Windows Media Player 7, I've noticed that there are some files that RUL's mini-WMP window just wouldn't play -- the Play button and time-slider would be disabled.

I believe I've figured out at least one reason why that happens.

WMP does NOT like it when there is a percent sign (%) in the path to the file.

RUL/WMP will not play M:\\AC%DC\\The Razors Edge\\Are You Ready.mp3 (or any other file in that folder), but it will play M:\\AC DC\\The Razors Edge\\Are You Ready.mp3 (or any other file in that folder).

There's also some strangeness related to this and the Windows Explorer in W2K, but I haven't worked out a definitive pattern yet.