Question : restore default open program

I changed my DLL in windows 7 by mistake to open with notepad, how do I change it back to the windows 7 default for .dll?
I think this is a reg file.

Thanks

Answer : restore default open program

Hi,

!!alwayas back-up before editing the registry!!

open regedit and navigate to:
HKEY_CLASSES_ROO\.dll\
there should be a OpenWithList key, delete it

you sould also check:
HKEY_CURRENT_USER\Software\Classes\.dll