The title is misleading, the creators don't even claim this themselves: "OpenMW is an open-source game engine that supports playing Morrowind by Bethesda Softw

The title is misleading, the creators don't even claim this themselves: "OpenMW is an open-source game engine that supports playing Morrowind by Bethesda Softworks. You need to own the game for OpenMW to play Morrowind."