>>I guess it would be better to have this as some external file with paths. Because there are .NET 3.0 and .NET 3.5

For .NET 3.0 and .NET 3.5 we will use regasm from .NET 2.0 package since
they both are something like "Addon" for .NET 2.0

In my opinion it's not a good idea to register assemblies in VFP code.
It's a task for application installer that must check all dependent components
like proper version of .NET Framework in this case.
Assembly registering requires administrative rights and we must always check this fact.