lol you are doing it wrong, you don't load any file from the image/disc, you load the entire disc just like how you would load an iso file on a virtual optical disc such as daemon tools, So you need to image the whole game disc first.
even today emulation isnt perfect, issues here and there specially when you up the internal rendering resolution (has fixes but still glitches occur)
then you run the game using iso mode (in CDVD option) then boot (fast or full if you want to see the playstation 2 logo)
btw, some related videos i uploaded before (pcsx2 game vids)