About new environment variable

[Zhongli Xu]

After I add an environment avriable in the system.reg file, e.g.
[System\\CurrentControlSet\\Control\\Session Manager\\Environment]
1185851455
"MY_VARIABLE"="VALUE"

I tried to read this variable thru the API GetEnvironmentVariable(), but it
failed.
Other variables, such as PATH, OS, are OK.

Any idea is welcomed.