how can edit builtin shader in inspector to see source code?

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I download builtin shader archive from unity3d.com,but I want to edit or see the shader code,not the properties of the shader when I edit shader in Inspector Panel.
Can my thought achieve?and where should I position these files ?
thank you .

@Namey5,
thanks a lot .
I found a quick way.download the built-in shader archive,and decompress it .Then drag into unity project panel,then you can select the built-in shader and edit.
this will save time to found which file is contains the shader you want to look.