The way the main frame sets up the application icon
(i.e., using wxIcon to load the image in
__set_properties() of class MyFrame()) does not work on
Windows. A working way would be something like the
icon = wxEmptyIcon()
wxImage( "DirsSync_ico.png", wxBITMAP_TYPE_PNG)))
The image has to be 32x32 of any format wxWindows can load.