erm, it's a bug with the File Types thing(it was already set to open in same window). i messed around with them(changed the icon of the folder) and automatically, it makes it "Browse with IrfanView" since that's what there is...
if i want to open the folder instead, i have to right click and select open.
and also like i said, Tony Klein posted a solution to the problem(some website with a script to fix it) but i can't find it.
also, i just tried what that website told me to do and it still didn't work.