blenderplayer reading external blend files

On the blender website i read this
“With stand-alone games however, any data that is included inside the actual stand-alone executable is covered by the GPL. If this is a problem then you should set up the stand-alone player so it reads from external .blend files.”
can somebody please tell me how to get blenderplayer to do this?

blenderplayer.exe path_to_blend_file.blend

how do i make a path in OSX?