I need to change the Win98 default font

I am dealing with filenames that use the extended character set.  If I open
up a DOS box and do a DIR, I get the correct file listing.  If I use
FindFirst, I get incorrect filenames.  Therefore, I need to change the
system font that Win98 uses internaly.  By default, Win98 uses MS Sans Serif
as the system font.  I need to change it to either dosapp.fon or MS Line
Draw.  Ho do I do this?

Thank you.