Yes, the add-on works with Microsoft Flight Simulator X. In fact, this is the only supported version of the game. I have checked stores and websites, and this is the only information available for users.
Compatibility: Microsoft FSX
Operating system: Windows XP / Windows Vista / Windows 7
Requirements:
- CPU: 2.40 Ghz Dual Core
- Graphics: 512 Mb
- RAM: 2 Gb
- Hard Disk: 54 Gb