Why I can't run the Snipping Tool from WPF?

I've created a WPF Window with a lot of buttons, each of them run a different program. To run MS Word, for instance, I used:

System.Diagnostics.Process.Start("C:\\Program Files (x86)\\Microsoft Office\\Office14\\WINWORD.EXE");

But when I try to run the Windows 7 Snipping Tool the same way it doesn't work. It was supposed to be like this:

System.Diagnostics.Process.Start("C:\\Windows\\System32\\SnippingTool.exe");

I'm sure the path is correct, but always appears a message saying the file wasn't found. I would like to know why is this happening.

Important: I use Windows 7 64 bits.