In the Save As dialog box, click the Tools option in the lower left
corner. Select General Options from the menu. Create a Write
reservation password or select "Read-only recommended". With a Write
reservation password, others can open the file but cannot save changes
to the file without the password.
In the future, please post general questions about Microsoft project to
the Microsoft.public.project newsgroup. This newsgroup
(microsoft.public.project.pro_and_server) is an outdated newsgroup we
are trying to shut down.