When a file is created on a network file system (NFS) server, a default set of permissions is applied to the file to control access to the file. By default, Client for NFS uses the following default permissions when it creates a file on behalf of a Windows user:
Interix utilities and applications do not use these default
permissions when creating a file on an NFS share. Instead, they set
permissions according to the user's default mode settings as set by
the umask(1)
utility.
You can change the default permissions that Client for NFS applies to new files. For more information, see To apply default UNIX permissions to new files.