Using dll file from c++

Hi all,

I have dll file I generate from VC++ 2010. This library is to access my feedback devices.
I put this file in the asset folder, but the c# script do not find this library.

How to resolve this problem?

Thank you in advance

Put it in the /Plugins folder.

http://wiki.unity3d.com/index.php/Special_Folder_Names_in_your_Assets_Folder