This is a program I wrote for Diablo 1 which allowed code to be injected into the Diablo process without needing to run the .exe from the hacker. At the time of initial release there were tons of hacks which were delivered in .exe form and I, for one, was worried about running untrusted programs on my system. My thinking was that once someone was happy to trust diabhack.exe then they didn't have to trust any other .exe file.
Instead of running the hack's .exe file to initiate the hack, the hack could be distributed in text form (.hak files). The user was also able to remove the hack if they wanted and combine them.
I released the code a while back but no online copy of the source tree exists to my knowledge, so I have released the source once again for posterity.
-- Andy Duplain