> Using 0& instead of 0 crashes in x64 applications.

Strange. But using 0 in x64 is as wrong as using 0 on x86 i.e. it does not crash under x64 purely by chance. You have to use NULL (as in nullptr) in both cases which as a numeric literal is 0& in x86 and 0^ in x64 (the 64-bit LongLong suffix is ^).

This will probably need a separate Const NULL_PTR As Long/LongPtr = 0 with conditional compilation on Win64.

cheers,
</wqw>