The following commands will undo the effects of the arch/fixlinks command in the Win64 installation of the WRF Preprocessing System (WPS).
ln -sf geogrid/src/cio.c metgrid/src/cio.c ln -sf geogrid/src/cio.c ungrib/src/debug_cio.c ln -sf geogrid/src/cio.c util/src/cio.c