System Folders and string interpretations

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I'm running Windows 8.1
When I use this
Macro Macro78

Code:

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if(!BrowseForFolder(s "::{14001F50E04FD020EA3A6910A2D808002B30309D}" 4)) ret
out s

It always points to "C:\users\<username>" folder only.

But if I try this

Macro Macro79

Code:

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if(!BrowseForFolder(s "::{20D04FE0-3AEA-1069-A2D8-08002B30309D}" 4)) ret
out s

It will point to "My Computer" folder.