ActiveX on 64-bit OS; Which to use: 32-bit DLL or 64-bit DLL?

Question:

Help clarify something for me please. I develop in a 32bit environment, but
deploy to windows 2003/2008 64bit servers. Do I install the 64bit or the
32bit ActiveX on the servers?

Answer:

In Visual Studio C/C++ applications, you may target either win32 or x64. If your application targets win32, you should register (using regsvr32) and use the 32-bit Chilkat ActiveX DLL for both win32 and x64 systems. If your application targets x64, then you must register and use the x64 Chilkat ActiveX DLL and it may only run on 64-bit systems.