How to access "Active solution platform" through a macro?

Hi,

I want to access the name of the active *solution* platform through a macro, as I want to target different Windows-Version by specifying the platform.

I know that I could duplicate the *project* configurtaions and assign them to the different targets. But

1. I want to control the target by using property-sheets

2. I have more than 50 projects with at least two configs for each, thus duplicating the configurations is not an option

Please provide a macro for accessing the active *solution* platform.

Thanks

Tobias