Why is my Platform environment variable defined as 'BNB'?

Question

Something, maybe the windows sdk or visual studio installer, has defined the Platform environment variable and given it the value BNB.

What does BNB mean, and why is

Answer 1

I used the EnvironmentVariables route, this worked & no reboot required

Answer 2

"HP Easy Setup" ? It creates a PLATFORM environmental variable that msbuild will default to if its not directly provided, see http://social.msdn.microsoft.com/forums/en-US/roboticssimulation/thread/8c158025-c48e-4ae1-9921-b8ee4f390bac/