One of the little quirks of x86 is that you can run 16-bit code just fine within an otherwise 32-bit process, and the Win16 API is small enough that it's practi

One of the little quirks of x86 is that you can run 16-bit code just fine within an otherwise 32-bit process, and the Win16 API is small enough that it's practical to write wrappers for all of it that just call into the 32-bit functions. This isn't feasible for 32-bit code on 64-bit systems for a whole bunch of reasons.