This is quite honestly the best solution. If you do not know anyone with a mac though, try downloading the Live CD of an installation of Linux. Take for example the Ubuntu install disk. If you were to burn that onto a disk and boot from it, it would load the operating system straight off the CD and want to install. If you opt to not install the OS, you can still navigate around the linux installation and get to a partition manager and format the 64gb microSDXC card before you remove the disk and restart into Windows. It's a bit of a lengthy process, but Windows is not meant to format any form of storage in Fat32 to anything more than 32gb of storage.
I am pretty sure that should work. Otherwise a mac really would be the easiest bet. You probably could walk into an Apple store, put in the card, open up disk utility and then format your card there and leave.
Originally Posted by OddJobs
I have Formated 64 gb cards by:
1 find someone with a Mac to format it for you
2 Used a Cowon D3 to format card.