Choose installation path

[mrbogus]

Problem/Reproduction: When you launch the installer on Windows and click the install button, the program will be installed directly into a predefined directory.

Expected result/Solution: On windows this behaviour is not expected, so there should at least be a warning, i.e. The program will be installed to c:/whatever. Yes/No?. The better way would be asking for user for choosing a directory (which can be set to a default value if the user does not choose one).