Can an external drive's file(s) be retrieved from my Mac?

I have a corrupted Flash drive which contains a spreadsheet file which I worked on recently on the Mac, though I saved it straight back to the Flash drive (not the Mac's HD).
Can I still retrieve this file from the Mac's memory somewhere? Where do external files reside while you're working on them on your Mac?
It's an important file for a client (and no, my backup doesn't contain the most recent work I did on it, silly me), so any help would be gratefully received.

Hi-
Any work done would have temporary residence in the RAM and virtual memory, but, unless the data was saved to a file on your Mac's hard drive, the data is not accessable, and most likely long gone.

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Message was edited by: Pierre L.

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Can an external drive's file(s) be retrieved from my Mac?

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