Ah, thanks, using that I was able to fix it.

For anyone encountering the same problem:
I had to add the following as a lauch option in steam (Rickt click on Factorio -> Properties -> Set Launch Options):

--config "D:\users\wheerd\AppData\Roaming\Factorio\config\config.ini"

You will have to ...

I have the following problem with the steam version of the game, without any mods installed:

After I have loaded a game, if I try to save, the game freezes. After a while, I get an error message box with:
---------------------------
Error
---------------------------
boost::filesystem::read_symlink ...

I have attached the log file.

I actually still have the exact problem with the steam version of the game.