Doubles, Integers, and Strings can be converted to the new types, and vice-versa. The new numbers can be saved to and retrieved from a MemoryBlock, using its LittleEndian property or a user-defined Boolean.
REALbasic 2006 now has built in versions of signed and unsigned 32-bit and 64-bit integers. The names used for the new types are UINT64, INT64, and UINT32. These are the same names I used in Integer Plugin, so there is a conflict. So Integer Plugin should not be in the Plugins folder if you're using REALbasic 2006 or later versions.