reading a Library and renaming its contents

Hello!

I have a library containing KeyedFiles in it. I am able to read the KeyedFiles 
without problem. However, what I want to do is read the contents of the library 
that the keyed files exist in, and then rename those files. Anyone know how I 
can do this?

I tried using IFS file to open my library. But when I use the list() method, it 
doesn't return anything even though the library has contents. Then again, the 
list() method seems to be for listing contents of a directory, whereas I'm 
trying to find contents of a file.

Thanks for any help!