The default filename for the File Handler configuration file is
extfh.cfg but you can use a different filename by setting the EXTFH environment variable. For example:
Windows:
set EXTFH=c:\mydir\test.cfg
sets the filename to
c:\mydir\test.cfg.
UNIX:
EXTFH=/mydir/test.cfg
export EXTFH
sets the filename to
/mydir/test.cfg.