Developer's License and why Quanta sucks

I have been searching google, yahoo and altavista for a few days off and on and was wondering if a person would need to obtain a Microsoft developer’s license to make open source software for people with MS OS? If that was the case, does that mean Blender(Ton) had to purchase a Microsoft Developer’s license to make Blender available for MS OS?

Probably not, but I will try to absorb any information any of you provide me.

[turret’s]Quanta sucks[/turret’s]