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Checking your help file, it looks like you ask Windows for a list of time zones. I added the following to the registry (I'm using Windows XP) after a bit of reverse-engineering and guessing and it seems to work (in that I can then pick it from your list and Windows' Date/Time list):

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Univeral Time Coordinated]
"Display"="(UTC) Also known as \"Zulu\" time"
"Index"=dword:00000055
"MapID"="0,1"
"Std"="UTC"
"TZI"=hex:00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
"Dlt"="UTC"

...you may want to consider offering the option of adding this to the registry during installation.