I am just hitting myself over the head right now. I wanted to change my "EDIT" setting of .BAT files to PsPad - instead I accidently changed the OPEN menu.
Now I was able to remove the entry using "Defaults Program Editor", a nice litte tool. But now I dont know which "default program" to select when doubleclick .BAT files. I tried CMD.exe, but maybe I need some option to make it run, it just opens the command line and does nothing at the moment :-(