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INT 21 - DOS 4.x internal - COUNTRY-DEPENDENT FILENAME CAPITALIZATION
        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 and 4.01 due to a bug