[Zope] using Page Templ.: to change meta_ type of objects

in order to use page template in Zope I build a "template site" on my HTML editor on my local PC, where I see the default values of tals. Then I FTP-Upload the whole directory structure on Zope on remote server. Now I want to tell Zope to execute the tal statements inside the html files, but Zope don't knows it has to consider them as "Page Template" objects. How can I change their Meta_Type in an automatic way?