Actually that's wrong :) It works if I call the copy tool directly with wine. But calling the batch file with wineconsole gives the same error. So it could be that wineconsole/batch files/dos mode/whatever don't like the very long extensions or the chars contained. Yep, it doesn't like the _ after the dot. After removing the underscore it works also with the wineconsole. Any ideas?
Seems like that was an error on my side. The copying went fine but there was an +*รง%" command after the copy in the batchfile which changed the files. That's why I thought the copy went wrong. Sorry for the noise.
bye Fabi