I found out, that nothing can help me... It is unbelievable ...
Maybe it is my provider, who makes mistakes. I don't know.
THE STORY:
Yesterday I tried it again: "Invalid CD Key", okay, not amazing...so I send the rtcwkey to a friend in Stuttgart, he should try it! He had an invalid key, too (using my file the right way).
Then I send the file to a UNIX User ... he checked it ---> key was valid!
He send the File back to me ---> key was invalid!
So, I know, the key works, but not on my machine! (And also not on my Laptop...)
And when I tried the keys of the other guys (so we changed the keys for a short while for testing) they were working!!! My key is the only one who doesnot work on my PC...
I hate it!
The last two characters are only for ingame typing of the key...they are not written in the file and the strange "[]" is a line break in the windows editor!