Armor Alley (1990), boxed software set (PC version)
"They just don't make 'em like they used to."
One eBay search and $39.99 later, I now have my own copy of a game I played just over 20 years ago.
The combat handbook looks nicely thought-out and designed, at first glance; it's the accompanying detail that made software like this special.
This game was originally published for the Mac; very interestingly, its native Mac UI was ported to the PC.