Okay, I assume I found it myself. Is this the right workaround to convert for TDM 2.01? wiki.thedarkmod.com/index.php?title=I18N.pl I hope, this will do it. The original files from the downloader won't. I will try it. Let's see, if it works ...
He didn't bothered me at all! I just appeared before him so that he recognized me, then I ran away back to the street. He followed me, but I was faster. So I could hide in the shadows and he passed me. The way was free to enter the inner courtyard. That's it!