I did that before.
If this was a plain text file, you could use a disk editor to find it. I am assuming a .wps file isn't plain text.
You might still be able to do it by 'copying' a small piece of the backup file (from a disk editor) and using it for the search function.
UBCD has a few on it (does fast searches) and Disk Investigator runs under Windows (slow searches, but a good copy sectors funtion)
The site I had posted the account of doing it is no more, but I found a copy on Web Archive
http://web.archive.org/web
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by: dbruntonPosted on 2009-02-06 at 17:59:35ID: 23576109
Try Recuva http://www.recuva.com/ Free for use.
or
GetDataBack http://www.runtime.org/ Free to try. If it sees your files you pay for full functionality.