Use Material File Browser via C++ SDK

I want to open the Rhino material file browser in a specific comand. I know the CRhinoGetFileDialog. There I can specifiy different file types (defined in CRhinoGetFileDialog::file_dialog_type), but material (*.rmtl) seems not to be available there. Ideally I also want to have a preview of the material thumbnails.

At the moment I’m using the standard MFC file browser.