>>I don't have the VFP6 here, but I remember I've read that the V6 class browser can read .TLB files - so if this is correct, the info on COM objects can be retrieved at least at design time. Is Class Browser using this DLL?

Maybe TLIREG32.DLL is installed with VS6 or VB6, but not stand alone VFP6. The Object Browser (not class browser) with VB and office browses type libs, but it's visually only, not programmatic. The class browser used foxtlib.dll to get typelib info.