This new Gmaptool was the solution.
I asked the author of Gmaptool and I was told there was no "F:" record in the .img file:
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Gmaptool is changing Header (Map-)name in this "F:" record
I used the "Join" tab to create a new .img file with the old .img file.
I filled out the FID and PID and "Joined" the .img file.
After that there was a "F:" record in the .img-file:
[Only registered and activated users can see links. ]
Now I could use the "Change" tab to change the Header (Map-)name:
[Only registered and activated users can see links. ]
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