Sharepoint 2010 message – Some files can harm your computer

When users were opening word files from a SharePoint library, that they had read access to, they would get a pop up message:

Open Document

Some files can harm your computer. If the file information below looks suspicious……..

open doc message

This was resolved by adding the SharePoint site to the Internet Explorer trusted sites list.

I rolled this out Via GPO, adding the trusted site with a registry addition.