How to include file extensions in...

When printing contact sheets from the Print module I don't manage to have the file name inclusive of file extension under each thumbnail (e.g. Maria.jpg); so far I only managed to have the file name without the extension (e.g. Maria). Any idea how to do it?
How to include file extensions in...
So, is this impossible?
How to include file extensions in...
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%26lt;br /%26gt;I doubt it's impossible, but why would you choose to do this? I we know, perhaps another method may suffice.
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%26lt;br /%26gt;MacBookPro 2 Ghz Intel Core Duo, G-5 Dual 1.8; Canon DSLRs

Well... I just would like to have contacts of my pictures, with the file name complete with its extension under each thumbnail. It would allow me to say at a glance which are raw files, which TIFF and which JPeg.

Ah, makes sense. Other than manually inserting a few characters, I dunno.