C++/CLI unresolved extern with SHGetFolderPath

Hello
I'm trying to learn how to make form applications

This is a simple app that gets %appdata% path after pressing a button.
The syntax looks good so I can't understand what I'm missing.
Could you please help me?
Those are part of the code (the only part that I think is involved in the error)
Thanks
http://www.pickinpatchfarm.com/16gfmg7.png

http://www.pickinpatchfarm.com/2dvo85e.png
All right, that worked.
I totally forgot it
thanks!
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