The AccessMask property is a bit array representing the access rights to the given file or directory held by the user or ...

The AccessMask property is a bit array representing the access rights to the given file or directory held by the user or group on whose behalf the instance is returned. This property is only supported under Windows NT and Windows 2000. On Windows 98 and on Windows NT/2000 FAT volumes, FULL_ACCESS is returned, indicating no security has been set on the object.