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Jonny, the -25 just pads the string with the default padding character (of a space). The output should have been all vertically aligned in a column, but it got messed up when I posted it here.
...

Here you go


namespace Wmi
{
class Program
{
static void Main( string[ ] args )
{
ManagementScope scope = new ManagementScope("\\\\" + Environment.MachineName + "\\root\\cimv2");

Try calling IWbemServices->GetObject(...) using "Win32_BaseBoard.Tag=\"Base Board\"" as the class name.

[Edit] Oops, that's C++. I'll see if I can dig up the C# approach.