How can I change or fix an association of a .dll file in Windows 7?

Joeri December 31, 2011
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I need to remove/undo the association (notepad) for a .Dll file.

I’ve successfully followed these steps:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\[fileextension]\OpenWithList. and deleted the unwanted file.

Then I checked the Recommended Program List for .Dll file. But the unwanted program was still there in list. So I thought changes might be reflected after reboot. But even after reboot it was showing the program in list.

I’ve again confirmed that key is deleted. So what’s wrong?

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