Web Application Could Not Find Executable Files?

I'm now running the windows 8 64 bit OS, and logged by a Microsoft account.

Now I am doing some work using Visual Studio and encouter some problems about the PATH variable.

1. Under current Microsoft account, I cannot see the full PATH variable neither in CMD or the Environment Variables dialog, the figures below shows the current view:

This is my current PATH

and, of course, I set it under system variables.

Well, this path works fine in command line executing, but in visual studio, it doesn't work.

2. So, lets see what I have in visual studio (run as administrator):

Code:
System.Environment.GetEnvironmentVariable("path");
"C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32
WindowsPowerShellv1.0;C:Program FilesMicrosoft SQL Server110ToolsBinn;
C:Program Files (x86)Microsoft SQL Server110ToolsBinn;C:Program

[Code]....

If you're willing to look at the text above, you'll find that this "PATH" is totally different with the one we set in Environment Variables dialog or get from the CMD.

I want to use some executable files in "d:commonin" with my web application hosted by IIS8, but I found that the web application could not find the executable files in "d:commonin", which should exist in "PATH"

Well, though I can just put the executable files into system32,