"Microsoft .NET Framework 3.0" for 64-bit systems

Question

Hi gurus,

I've been reading this .net deployment with installshield and I'm quite confused. All along I thought it won't matter if you're installing a .NET app on a 32-bit or 64-bit systems, because it will already be handled by .net. But why is there a seperate reference for .Net Framework 3.0 (x32) and .Net Framework 30. (x64) ?

Does this mean that during installation, I need to check first if it will be installed on a x32 or x64 machine and install the appropriate reference? Do I also need to modify code so that it will run on a 64-bit system?

Thanks in advance.

Regards,
Jan