I would save the extension in another field, which would be computed from 
your file field, then you can use regular selects to find them.

A less efficient in terms of query speed (it does use less storage) 
alternative is to use some of these operators
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#like,-regexp,-startswith,-contains,-upper,-lower

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