Error: opening these files might be harmful your computer

To resolve this issue, open Internet Explorer

Click Internet Options under Tools

Click on the Security Tab

Click Local Intranet and click the Sites button

Check the box next to the following:

Enable All Local....

Enable All Network...

Enable All Site...

Click the Advanced button and add the IP address of the network computer where the file is stored.

This will resolve the issue and will not generate future warnings.