I implemented some sort of compatibility for old programs, assuming that
when it passes a pattern in all uppercase it is not able to handle
lowercase, and so all is displayed. It does not happen when the
fileselector is called from XaAES on ext2.
Sorry to say that, but to me this does not sound like an good
compatibility enhancement. Because the old systems could not handle lower
case names, it interprets lower cases as uppercase. At least, that's what
the docs say. So, when I code an "open file selector" for old Ataris, I
would also pass lower case file ext, because I think: "that doesn't
matter". I assume many programs pass lower case, but mean upper case.