Hi anyone,
I have opened .dll files with Notepad someday, and its form(appearance) has been changed into Notepad. After that, Notepad program became the default program to open the .dll I wanted to return them their normal appearance. I have tried clicking 'right-click' on any dll file and then chose open with, after that, I have tried looking for another program but I didn't found anything other than 'Notepad'. I was expecting that there is some error with Registry files, so I have run some program to fix the registry errors. However, this did make no difference.