How to set associations in the control panel

I operating system is Windows Vista Ulitmate 64 bit and I am trying to make an association in the control panel so that I can open a program with word pad and I dont know what to change in the control panel, bcause there are so many. When I to adobe and right clicked on host there are three assocication there none of which I need. It says open with Generic, text, Hex editor and Hash values.