How do I enumerate all time zones in .NET?

I would like to have a list of all the time zones available on a Windows Machine. How can I do this in .NET?

I know about the TimeZoneInfo.GetSystemTimeZones method, but this returns only the currently selected time zone(s)

DateTimeOffset current = DateTimeOffset.Now;
ReadOnlyCollection<TimeZoneInfo> timeZones = TimeZoneInfo.GetSystemTimeZones();
Console.WriteLine("You might be in the following time zones:");
foreach (TimeZoneInfo timeZoneInfo in timeZones)
{
   // Compare offset with offset for that date in that time zone
   if (timeZoneInfo.GetUtcOffset(current).Equals(current.Offset))
   {
        Console.WriteLine("   {0}", timeZoneInfo.DisplayName);
   }
}