Add support for downloading Windows-only games in Linux native client and invoking via Wine (option Wine prefix support)

[boombatower]

Eventually could even have community and officially curated Wine setup that runs before game install. Winehq already has the steps, but making them transparent through Steam would be quite slick.

At the very least just being able to download and invoke in Wine so that folks could go through the steps themselves without needing to run a native Steam client and a Wine Steam client.

[Tele42]

Duplicate of #74.