This will patch DirectDraw (used by DirectX 6 in-game) to work on modern systems.
When prompted by the game, do not install DirectX 6.
If you're looking for the training disc developed by Magic Lantern Playware, see here. The game and expansions are no longer available for sale. Instructions may also apply to Rainbow Six 1 as they share the same engine. Instructions for playing Rainbow Six 2: Rogue Spear and its expansions. Playing Rainbow Six 2: Rogue Spear in 2020 and Beyond