Redirect topic syntax

Hi.

I have a CHM file that contains a TOC entry that is a redirect topic to another CHM file that sits externally to the project. The redirect works except that the external CHM is displayed in the same window. What I'd like is the CHM is launched in its own window as if it was launched separately (i.e. two CHM files open). I guess I need some additional syntax to the redirect meta tag but I'm not sure what that is. Can anyone point me in the right direction? The current meta tag is shown below.