i could not get the mission editor to open with the Steam download.
i was able to fix it by installing the Microsoft.NET Framework, which i did not have installed before.
i also had to install the Microsoft Visual C++ 2005 Service Pack 1 Redistributable Package ATL Security Update from this page:
http://www.microsoft.com/downloads/detai...72-9112bab119c2the mission editor will now open for me.
the Steam version installs the editor to:
C:\Program Files\Steam\steamapps\common\operation flashpoint dragon rising\Mission Editor
you start it by clicking on the MissionEditor.exe in that folder, or by placing a shortcut to it in a convenient location.
there are .mssn mission files in the folder:
C:\Program Files\Steam\steamapps\common\operation flashpoint dragon rising\Mission Editor\Help\Missions
i post this in case it might help someone else.
p.s. the manual can be found here:
http://cdn.steampowered.com/Manuals/12830/OFP2%20MAN%20PC%20US%20V01.pdf?t=1254862411