
And try following.. go to Tech Room, select Mission Simulator from the top selection menu. Then select in lower selection menu (lower left corner) Single Missions. And another check of that didnt function... Make sure your mission files (.fs2) are in freespace folder or in one of the subfolders (like data/missions)...
And for good guide how to upgrade to FS Open, read Karajorma's FAQ
Thanks for the warm welcome

Sorry, I forgot to mention I already clicked that "Single Missions" button without anything showing up there.
The Mission files are in the freddocs-Folder. I was already curios about that, but I don't move them away because the Documentation says:
Do not change directories; all missions have to go in a certain directory, and FRED2 puts them there by default.
I've moved the files to the missions folder now and it's working (doh).
I will read your upgrade Guide later, now it's time for some testing. ^-^
Thanks for the fast help.
Tynian