I answered in the MSDN Forums:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=542802&SiteID=1

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Carlos J. Quintero
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> Hi there,
>
> Can someone shed any light on how to add a new "resx" file to a project or
> any other file for that matter. I think "ProjectItems.AddFromTemplate()"
> may be the right method (?) but if so, how do you determine the name of
> the project template to pass. Thanks very much.
John Appleby - 11 Jul 2006 14:10 GMT
>I answered in the MSDN Forums:
>
> http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=542802&SiteID=1
And I've responded there (thanks)