@M123 Sadly not. Daemon Tools Lite just refused to work for me. I also tried another application to mount it but again no joy. I've just ended up playing the music from my phone because when I tab out of the game (to play the songs from the OST files) I can't reopen it.
@Wholan If we're really lucky, maybe we'll hear something about it after Forsaken EX is released (no date announced yet) - otherwise we might be stuck waiting until they've finished the System Shock remake...
Forsaken EX release date announced: 31st July 2018.
System Shock remake coming "late 2019/2020".
You didn't miss anything - due to the limitations of the ISO format, the music is not present in the Disk 2 ISO files available from the site.
Until someone updates the downloads with disk images in a format that supports CD audio, the instructions I posted are the only way I know of to get working music using the files available here.
I went ahead and dug up my Alcohol 120% clones of the disks and added them to the download post. Hopefully this helps some people. :)