exFAT support.

i realize the hardware won't support anything larger than 32GB, but there are other reasons to have it, namely FAT32 only supports filesizes upto 4GB, whereas exFAT supports up to 16EB (exabytes). while this may seem like an odd reason, i have videos larger than 4GB which I'd like to be able to watch on my phone, and I'm sure there's others out there with the same need