Nah, those came later, after the race was won. Originally all the killer apps were written for CP/M. That. Open hardware that you could buy and boot any OS you want on (having the potential to run CP/M was a major point, even if most people didn't do that at the end). The 8088 being cheap didn't hurt much either. The IBM PC-compatible won first, and (MS-, not PC-!) DOS followed simply by being the OS that came free with the PC.