Windows Standalone System.Windows.Forms.dll

Hey,
I know this subject have already many thread but i didn't find solution on it.
I am on Unity 2019.2.9f1.
I use System.Windows.Forms.dll from lib mono in editor and it work fine. But when in standalone build the function that use the dll doesn't work.
I read somewhere that i need to use the .NET dll in build, but i don't know where to put it. The mono dll is not present as dll in build files, it has only a .dll-resources.dat and put the dll in the same folder didn't do the trick.
How can I set it to work ?
Thanks.

 

I found that with System.Windows.Forms.dll, it work only with Scripting Backend set to Mono in Player Settings.