Allow to download/install Windows version for a Linux native game.

[Kzimir]

I don't know if you're gonna like this pull request :D My PR is based on the Makson's PR #317

Why i did this ?

• Some native games works better with Windows version and Wine.
• Native games can have an oldest version than Windows like Ruiner or Pathfinder Kingmaker
• And maybe others thing.

I tried and use it since a long time and it works (Download/Installation and DLC download/installation)

[sharkwouter]

This is a requested feature and I will try to get this working before the next release.