These links doesn't work

I have another question. How can I write this line into the register?:

@%SystemRoot%\system32\SHELL32.dll,-22921

There is a REG_EXPAND_SZ that need this info. But when I insert it, he give this:

<unknown:C:\WINDOWS\system32\SHELL32.dll,-22921

When I extract the file into a reg file, he gives me this line instead of the "@%SystemRoot%\system32\SHELL32.dll,-22921"

"InfoTip"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,\
6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,\
00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,\
2d,00,32,00,32,00,39,00,32,00,31,00,00,00

Who can help?