|Try checking your Temp files. Look for files about the same size with the TMP ending. Also look for files that start with ~|
Word Perfect and Winword use temp files while you have the document open. Sometimes they do not go away when you close the file.
I've saved a lot of VIPs at the company I used to work for by checking the temp files.
Check C:\Windows\Temp, C:\Temp and C:\Documents and settings\YourProfile\Local Settings\Temp.
It's a shot.