Unresolved external symbol error occurring only in 64-bit mode and not in 32-bit build

Question

I have a VC++ code (built using VS2008), which makes use of some static libraries (*.lib files linked statically during compile time).

For ease of understanding let\

Answer 1

Old Thread, I know, but found that I had to add "Explicit" exports to the DEF file to get it to work. Must be that the 32-bit was implicitly adding, but the 64 was not. Hope this helps someone :)