It would be nice to support long filename extensions to
the base DOS 21h file functions.
My problem at hand is that I am trying to extract an
UHARC 0.4 archive, but it seems an impossible task
under anything other than Microsoft Windows: by running
the version for DOS of the uharc 0.4 command line
utility, which is now limited by the missing long
filename support, the problem would be solved.