Int 21 Fn 65  U - DOS 4+ Internal - Country-dependent Filename Capitaliza  [D]

   AH = 65h
   AL = function
       A0h capitalize filename character
       DL = character to capitalize

       Return: DL = capitalized character
       A1h capitalize counted filename string
       DS:DX -> filename string to capitalize
       CX = length of string
       A2h capitalize ASCIZ filename
       DS:DX -> ASCIZ filename to capitalize

Return: CF set on error
       AX = error code (see AH=59h)
   CF clear if successful

Note:  nonfunctional in DOS 4.00 through 6.00 due to a bug (the code sets a
     pointer depending on the high bit of AL, but doesn't clear the
     bit before branching by function number).