let one define what file extentions belong to one type (on the search tab)

On the search tab one can choose what type of files the results can be (Program, Audio, Video, ...)
I'd like to be able to set up what file extentions belong to one type.

[vi_curious]

I will second this request. It could be added under the 'more search options'. I was a little surprised to not find it there when I first arrived.