Thank you very much Ters your instruction worked, I was able to open simutrans with the command line and get a simu.log file which hopefully explains why my save is crashing now after everything went well before.
So as I explained earlier, the latest savegame i'm using crashes a few seconds after loading everytime, however everything was ok until today.
It only happens on this particular.
I'm running Simutrans 112.3 SDL with Pak 128 on windows 7 64-bit
Here is my log file, so if someone could analyze it to detect what is wrong with the savegame?
Thanks in advance!