I got software for Ultra MP3, Mosquitos(games), but wonder how to install to my X800. I saw the file type include .pcm, .dat, .aif, .rsc, all files copied to my phone and tried but failed. please instruct me , higly appreciated your kind assist.

Instead of illegal copies, buy original versions that come in .sis (or .jar) files, which you can install properly: http://www.allaboutsymbian.com/shop/