Hi Genie
If CHDK is working with the 64GB card, how did you format 2 partitions? Did guiformat.exe do that for you?
If so I will add a note to the STICK page telling people to use it.
I presume STICK wouldn't format the card - under the covers STICK uses the operating system to do any necessary formatting, so if Windows won't format a 64GB card, STICK won't be able to either.