Thanks for your reply. Sorry, I guess I wasn't clear. I have no problem getting the program to access the official memory card. With a little luck and those instructions, I was able to successfully make a backup of my official card. (For some reason, following those instructions does not work all the time, but I can get it to work about 25% of the time) However, after restoring any .RAW dump with a save file (after the program closes itself upon writing the data to the card) the Wii/GC will say the card is corrupted and needs to be formatted.
Unfortunately I do not know enough about the data/file structure of the memory cards to know how the official cards are different from the unofficial cards, but apparently the same procedure/code used to write data to unofficial cards does not work with the OEM ones. Maybe someone else knows more about this.
-MD