Harpoon Scenario Editor

From the back of the game box:

When you've mastered the existing Harpoon BattleSets exercise your imagination and expertise by modifying existing scenarios, or creating entirely new ones! Scenario Editor is the only tool of its kind available to serious simulation strategy enthusiasts. This is the same in-house programming tool used by Harpoon programmers to produce scenarios for all the commercially distributed battlesets. Create groups and units for both sides, shift geographical locations, limit or expand available platforms and weapons using the complete Harpoon database, assign air and sea assets to base... the variables are endless, and you are in total control!