Some of our bundles are lookin a bit big, and i'm trying to track down which bundles these are to see if they are still in use.

If I look in (for example) \content\fd there are 29 files with names such as fd21a53f0f52b30d05ea9b94237e3b09.zc

Is there any way to relate this to whichever bundle this is?

Is the file name the GUID of the bundle? (is it that simple?)