i have two Samsung microSDXC 64GB cards, and works in FAT32 fine:
Samsung Pro MB-MGCGB - microSDXC UHS-I
EAN: 8806085213449
with LS300W work / LS460W I have not tried
http://www.computeruniverse.net/products/90493687/samsung-pro-microsdxc.asp
and
Samsung PLUS microSDXC inkl. SD-Adapter
EAN...