I think all of the above listed tools can render RC5 codes.  However, the OP has RC5x codes.  The easiest way to handle these is to use the much more modern IrScrutinizer.  On the Generate tab, select RC5x as the IR protocol.  Put 16 in the D box, 12 in the S box and the Extension in the F box, and click Generate.

Power On RC5x Device 16, SubDevice 12, Function 01
0000 0073 0000 0011 0020 0020 0040 0040 0040 0020 0020 0020 0020 0020 0020 00A0 0020 0020 0020 0040 0020 0020 0040 0020 0020 0020 0020 0020 0020 0020 0020 0020 0020 0020 0020 0040 0020 0AA8

Power Off RC5x Device 16, SubDevice 12, Function 02
0000 0073 0000 0010 0020 0020 0040 0040 0040 0020 0020 0020 0020 0020 0020 00A0 0020 0020 0020 0040 0020 0020 0040 0020 0020 0020 0020 0020 0020 0020 0020 0020 0020 0040 0040 0AC8