Those tiny wav files are called IR (impulse response) what you want to do is use an IMPULSE LOADER such as KEFIR.
Heres a link.
http://vstdatabase.blogspot.com/2011/02/kefir.html
There are many others such as lecab, lecab2, boogx, etc but for starters i suggest trying out kefir cuz its free, personally i use reaverb because i use reaper as my DAW and ReaVerb works great for me (otherwise id probably use sir2 to load my impulses) make sure to make it 100%wet 0% dry (100% mix in kefir). Dont use up too much length otherwise it will eat up your CPU.
Alright now bypass (cancel) the cab simulator and only use the amp (head). Its going to sound really ugly right? well load up KEFIR and and load up an IR, there are so many out there look up catharsis impulses , asem recto v3 l2, orange_2_mics, guitarhack, fredman, gods cabs, Clark Kent Match EQ IR Collection. And from there on play around w the sound. I recommend sucking out a lot of 200-500hz but not too much because you will lose guitar power. I tend to have a dip at 600 hz as well. Oh and if its too fizzy maybe cut at 4000. For beginners try not to cut more than 6db til you know what you are doing. There are a lot of threads on this, browse around and good luck!