clarification on driver bitness

While trying to offer some help to a Stellarium user on Cloudy Nights, and relaying my ASCOM driver "bitness" matter, we learned some fascinating information from Bob D (a software developer). He explained that if a driver is an EXE file then it does not matter if the driver is 32- or 64-bit. Whereas if driver is an "in process" DLL-type file then it is indeed usable only from 32-bit apps. Good stuff!