I can see there's a bazillion files called 'blah.vcf' in my attachments folder, due to all the Outlook people including their vCards on every email, but will Spotlight find them if I put ".vcf" (without the quotes) in the little search box in the folder's top right corner?

Will it hell.

Bizarrely, it happily finds all the 'signature.asc' files from digitally signed emails by putting ".asc" in the same search box.
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simon