[quote="leo"]I think the only good way to do this at the moment would be a script which does the search itself.
That isn't as hard as it might sound, since Opus provides objects for recursively looping through everything below a folder & its subfolders, and the Metadata object lets you get back the list of tags for a file.
Scripts (JS & VBS) Snippet: Enumerating files and metadata tags is a good starting point.[/quote]
Thanks for the pointer, Leo, although I think you overestimate my skill set!
I'll give it a go.