OK here is what I did: Scanned my D drive which I had recently erased empty space on. Only file Recuva found that was recoverable was a copy of my 'config.sys' file which contained only one line of text. I recovered this file and indeed it was 'as new' and readable. Next I secuely deleted this file using Recuva. Finally, I restored the file once again to a scratch folder using Recuva. The file was 'good as new' both in file name and in content - e.g. no erasing by Recuva. Here is the debug log:
[2008-02-02 08:17:56] [iNFO ] Recuva v1.10.223
[2008-02-02 08:17:56] [iNFO ] System Info: MS Windows Vista, Intel Core2 Duo CPU T7300 @ 2.00GHz, 2.0GB RAM, NVIDIA GeForce 8400M GS
[2008-02-02 08:17:57] [iNFO ] No update available
[2008-02-02 08:18:03] [iNFO ] Boot sector: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=
[2008-02-02 08:18:03] [iNFO ] Reading MFT
[2008-02-02 08:18:04] [iNFO ] Reading files
[2008-02-02 08:18:06] [iNFO ] Building folders
[2008-02-02 08:18:06] [iNFO ] Restoring tree
[2008-02-02 08:18:06] [iNFO ] Analyzing damage
[2008-02-02 08:18:06] [iNFO ] Processing recycle bin
[2008-02-02 08:18:06] [iNFO ] Returning list
[2008-02-02 08:18:19] [iNFO ] Deleting file config.sys
Please let me know if I may provide any additional information. I will be happy to help and/or to test a fix...