1. Download Patch.rar and get a Patch.exe file from the RAR archive.
2. Drag your ROM and drop it onto the Patch.exe. That's all.
Note:
This path is not only for "Wizardry". "Wizardry" is one of game to be patched by Universal Child's Play Patch.
The file having the ".bak" extension is the backup copy of the original nds file.