To launch the game, run wolf/wolf.exe.
DOS Games made for DOS require an emulator to run on Windows. Use DOSBox or a frontend like D-Fend Reloaded and read this guide to play DOS games on your Windows PC.
"Operation Wolf was a hit at the arcades, in part thanks to that wonderful cabinet. I have to admit that I've never played it outside my home. I used to play Operation Wolf first on a Commodore 64 (and yes, I enjoyed it) and later on a 386 PC. What I really loved was the smoothness of controls and the flow of the action. Levels are short enough and enemies comes at you at the right pace. It feels like the playtesters did their job." - Abandonware DOS