I use windows 7. I accidentally made the default program of .dll files as notepad. How to undo that?
Give this a try. I dont have windows so cant check but this should work. Control Panel --> Folder Options --> Should be a tab or button like "File types" --> There should be something like registered file type. Remove DLL from the list. I think you need to restart.
there is no such option to delete. i can chane the program only from notepad
keep it like that nothing will happen.