System font - %sf
%sf resets the text attributes and is used after any combination of %bf, %it,
%ul, %fn, and %ts.
%sf can also take a grave accent (`) but this only has effect if the program is
running under Windows 95. For Windows 95, %`sf selects the scaleable font that
is used in menus and controls. %ts (see below) can be used after %`sf in order
to set the size of the scaleable font. %`sf followed by %ts with a scale factor
of about 1.15 will produce readable text (see also use_windows95_font@).
The value returned by the function windows_95_functionality@ will indicate if
Windows 95 is running. This function returns the value 1 if the program is
running under Windows 95, otherwise it returns zero.