VS 2005 Getting Program Name?

As the title says, I'd like to know how I can get the program name but from an extension OR the "Open With: (program)" information.A kind lad here has advised me on using the registry which contains details of all default applications but I've no idea how I can go ahead of that. I've tried searching and using almost all properties of FileVersionInfo but it doesn't seem to work for me.

Right now, what I'm trying to do is to select a path from OpenFileDialog and use Button1 to launch the executable path. However, at the same moment, I'd like to take down the program used to launch the executable path.

Meaning, if the filename is Index.ppt, I would want to record in a textbox that the Program Name is Microsoft Office Powerpoint instead of the usual Index.ppt.

The only way I think is possible is by retrieving the information from the "Open With: (Program)" row in the Properties panel of the file but there seems to be no way of getting it. So any help possible? (:

EDIT: FileVersionInfo.FileDescription property only works for default programs(e.g.QuickTime Player / Microsoft Office Word) and not any subs for it so that won't work in this case.