problems with renaming and deleting

[locrian747]

Hi,

I'm using Limewire and having some problems with sorting the mp3s in my library.
With some files, if I want to rename or delete them, I get a message like this one:

"Unable to delete the file '12 - mouth's cradle' ...It may be in use by another application."

With the example above, I'd downloaded the file, added it to my playlist and played it a couple of times. then I took it out of my playlist and tried to delete it, and get that message.
I'm wondering what this means. Anyone know how I can delete this file? (or change it's name?)

cheers
locrian.