Thanks I have done some updates to the import stuff although I am a bit confused how that ._FILE_ID.DIZ could ever be extracted unless Mystic called to extract it directly.
I am putting a new build up now so we're on the same page again with recent changes. Let me know if you still have this happening, Mass email, etc.
Also I fixed the index bug in the file listings so run mutil -run packfilebases after you upgrade to make sure your indexes are properly generated and after that everything should be ok.