I've encoutered this game several times in my life. The only time it really worked was when I downloaded it from a BBS several years ago. It was the first time I played it. Of course, at that point it was highly illegal and the game wasn't too old... But that's was BBS was about back then, and I was young. No doubt this triggered my Gamer side when I was young too, getting all those good games freely before a net access even existed where I lived...
All the other times, the game was suffering from a copy protection and I never been able to circurvent it. I don't think I have access to a copy, working or not, of that game.
The OldWarez list of this site list Dungeon Hack as Abandonware. You can download it freely under the assumption that it's Abandonware, and if you find a working copy please consider contributing to the site.