Note:
For Windows Media Center to be able to store and read Metadata Information for any given Movie, then it is necessary that each Movie must reside in it’s own Folder (Directory).
For example:
If you have all your movies in ISO Files and all the ISO files are inside a single directory, then it will NOT be possible for Metadata Utility to generate XML Files with the necessary Metadata Information for each movie (as Windows Media Center will not be able to read Metadata Information when you have multiple Movies (Media sources) all combined together in within a single Directory.
In other words, in order for Metadata Utility to properly manage your movie library, then each movie has to be contained in within it’s own directory.