Unable to save file after recovery from backup

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http://serverfault.com – I have a Windows Server 2003 that acts as the file server. I have moved a lot of files from a backup (different domain) to the new shares. The strange thing is that people can open the files, but they can't save over it. Then it asks for a new filename (no overwrite). I have tried to take ownership as administrator, and removing the read-only (gray) checkbox from the folder (incl. subfolders and files). Someone knows what to do? (HowTos)