I have Windows 7 64bit running Windows Media Center and a Hauppauge 2250 TV tuner (with included IR receiver). Lastly, I have a Harmony 300 remote.

I have been scouring the interwebs in search of a way to program the power button to send the computer to sleep. Currently, the button only opens and closes WMC.

Recently, I have been in touch with Logitech customer support, who informed me it is "impossible" to do this since the original remote's power button behaves the same way, but also adding if I supply them with the hex code, he might be able to add this to my account.

So, I searched this site, and found hex codes for a Microsoft keyboard for WMC here: [Link: files.remotecentral.com];.

I sent him the following codes:
PC Sleep Pwr:
0000 0073 0022 0022 0061 0020 0010 0010 0010 0010 0010 0020 0010 0020 0030
0020 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010 0010
0010 0010 0010 0010 0010 0010 0020 0010 0010 0010 0010 0010 0010 0020 0010
0010 0010 0010 0010 0010 0010

Power Toggle PC:
0000 0074 0000 0022 0060 0020 000F 000F 000F 000F 000F 0020 000F 0020 002F
0020 000F 000F 000F 000F 000F 000F 000F 000F 000F 000F 000F 000F 000F 000F
000F 000F 000F 000F 000F 000F 0020 000F 000F 000F 000F 000F 000F 0020 000F
000F 000F 000F 000F 000F 000F

to which he replied:
We are sorry to inform you that the codes that you sent are all invalid codes we cannot convert those hex codes to an IR language command that you needed into your device, you need to re-check your codes.

I suppose I am missing something here, but what?

There seems to be an issue with truncated codes in the XLS file... but the codes in the CSV in the same download are fine.