Thanks for your welcome;) Finally I figured out the reason why I was not able to delete the files: the root directories (the cryptic ones) were okay, but everything below (files and directories) had Administrator as read owner, but the write owner was empty. Therefore nobody would ever be able to modify these files... The solution: Just share each of the files and subdirectories, allowing network users to modify, and then you can delete. Of course this is an erreanous behaviour, but in this case I love it Thanks and bye Matze