*Note I did this in 2010 but should work the same in 2013

File | Options
Customise Ribbon
Tick Developer, OK

Select the Developer Ribbon
Custom Forms section
Choose Form
Look in: User Templates in File System

This shows the folder of C:\Users\USER\AppData\Roaming\Microsoft\Templates\*.oft

Is this the Folder you wish to open?

Click the Visual Basic Button
Add the following code:

Sub OpenFolder()

    Dim Foldername As String
    Foldername = "C:\Users\USER\AppData\Roaming\Microsoft\Templates"
    'Foldername = "%UserProfile%\AppData\Roaming\Microsoft\Templates\"
    
    Shell "C:\WINDOWS\explorer.exe """ & Foldername & "", vbNormalFocus

End Sub

Swap USER to your Username

Now in the Quick Access Toolbar
More Commands...
Macros
Choose the Macro
Add >>
Change the Name and Icon.