need help deleting junk COD files
 

I just downloaded bbsak and read all about it. what i wanted to know is what if any COD files could i delete to get some of the junk off my bb. like the sample pictures and video the bb visual voicemail and that type the stuff. I didn't want to just go and start deleting things and mess up my bb thanks. or is there a renfence i could use to see what COD file does what.