Either my TOSEC is not up to date or incomplete - only entry I have is
"Seven Cities of Gold (1985)(Electronic Arts)(Disk 1 of 2)"
According to Exotica (http://janeway.exotica.org.uk/author.php?id=3959
Powerslaves was active from 1988.
Bitstoppers was active from 1987.
So the game is from 1985 - but the crack is from a later date?