Alex B-
Thanks for your help, this has been bugging me. I got it to work per your suggestion, however in MC 11 "select all fields/just visible fields" is not an option. It just takes the visible fields.
Here is my situation, just to clairify from my initial post: I have about 100 CDs (a mix of writtable and rewrittable) on which I burned a mix of .shn and .ape files. None of the files have any tag information imbedded within the actual file. All the CDs were imported into the Library.
Later, I created my own custom fields, and started entering data into the Library database.
Now, when I put in a CD, Media Center recognizes it, shows me all my custom fields and correct data for the tracks. The problem is that when I copy those tracks, within Media Center, to a folder on my hard drive, they appear in the folder as non-imported, unrecognized files, with no tag data. I'm surprised that moving files within MC, from one folder to another retains the correct links to the library data, but moving from CD to HD doesn't. This would be a VERY handy feature