Possible Duplicate:
Associate a File Type with a Specific Program
I downloaded a program and it configures itself as default program for .mdf files and I see a ugly icon for mdf files in my windows right now!
As default, mdf files has a nice icon on it and there was no program associated with this file type.
Given that there was no program associated with that, I cannot get back the settings. Is there any way I can reverse this inside registry or something?