The new v1.62 Beta A version now supports true hiding and unhiding of FAT16/FAT32/exFAT/NTFS partitions so that they are not accessible to Windows until unhidden, but they are still accessible to grub4dos (and the files inside). For more info see here.
It also includes the lates tversion of grub4dos 0.4.5c and 0.4.6a. The latter 0.4.6a now works with large exFAT drives and has a few bugfixes which may make it more reliable than it was before!
Beta Downloads are in the Alternate Download folders (link on Download page), as usual.
Recommended for Easy2Boot (fastest!) - SanDisk Extreme SDCZ880-128G-G46
BitCoin also accepted.