Need a way to open VIP URLs from VIPM for Mac/Linux users

VIPM 2012 can create links that when users click on them in the browser will open VIPM and install the file... but only on Windows. For Mac and Linux users, there is no way to use a link, since there's no way to download the file and then open the package. The main VIPM menus need an equivalent to File >> Open File but for opening URLs. (Or fix the system so that links will open VIPM on these other platforms, but I get the impression that's hard to fix.)