Hello I have a problem whenever I try to open contentconverter.exe it crashes right away. I've tried running it through command line but i'm stuck at this "Converting FSX terrain\scenery\autogen from 'C:\Program' and outputing to 'C:\test' "

You need to enclose the path to your FSX installation with double quotes in your command, like this: "C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X"