cannot add a reference to the project

I use Visual Studio Professional 2017, version 15.2 (26430.12) on Windows 10. I try to add reference to System.Windows.Forms.dll and WindowsFormsIntegration.dll  but receive the massage as in attached picture.
What is wrong and how can I fix this ?
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Ayoub RouziCeo & CoFounderCommented:
This thread will help you to resolve the issue:

Just to sum it up, the thread says that I need to add a certain .dll file on the cache for me to add References. Not sure why this issue occur but I hope it helps anyone who encounters the same issue.
mastiSoftAuthor Commented:
Hi I did as was suggested and as you can see from screen shot it was don correctly, but I still cannot add a reference to System.Windows.Forms
as stated in the error message you can't add references to dll's exported from a .NET assembly.

and the reference to the assembly which contains System.Windows.Forms.dll and WindowsFormsIntegration.dll already should be done automatically when you created the windows forms project.


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mastiSoftAuthor Commented:
thank you
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