Sets the current working directory (CWD) number (the default directory)
#include <nwfileng.h>
LONG FESetCWDnum (
LONG CWDnum);
(IN) Specifies the number of the directory that is to become the default directory for the current thread group.
This function returns the old CWD number.
The FESetCWDnum function sets the directory number that is to be used as the default for parsing pathnames that are not full pathnames.