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INT 2F - Multiplex - DOS 3.3+ internal - OPEN FILE
        AX = 1226h
        CL = access mode
        DS:DX -> ASCIZ filename
Return: CF set on error
            AL = error code (see INT 21/AH=59h)
        CF clear if successful
            AX = file handle
Notes:  can only be called from within DOS (assumes SS=DOS CS)
        equivalent to INT 21/AH=3Dh
SeeAlso: AX=1227h,INT 21/AH=3Dh