Hey mvpq,
Please verify the system requirement for the game from the link below.
**http://www.microsoft.com/games/pc/combatfs3.aspx**
As we can see that the supported operating systems are Microsoft® Windows® 98/Me/2000/XP, hence you could be facing compatibility issues.
Nevertheless, try this method below that has helped many users in getting the game to play in Windows 7. Please try the same and see you get successful in playing the game.
1. Copy CFS3.exe from the game location for example: C:\Program Files\Microsoft Games\Combat Flight Simulator 3
2. Paste it to any location.
3. Rename the file, copy and paste it to the original location C:\Program Files\Microsoft Games\Combat Flight Simulator 3
4. Right-Click on the new file which was recently moved and select “Send to Desktop (Create Shortcut). This creates a new shortcut on the Desktop
5. Go to desktop and change the compatibility setting of the new shortcut icon to Windows XP (Service Pack 2)" under Compatibility mode.
You may refer this article for more information
Make older programs run in this version of Windows**http://windows.microsoft.com/en-US/windows7/Make-older-programs-run-in-this-version-of-Windows**
Regards,
Shinmila H - Microsoft Support
Visit our Microsoft Answers Feedback Forum and let us know what you think.