VS2019 creates ref folder

[DanielGlos]

I have noticed that VS2019 creates this 'ref' folder inside my project. It contains just bunch of DLL's and I get an error when I try to delete it. When I close VS and delete bin and obj folders and reopen solution it is not there but gets created again shortly after.

I could not find much info on what is the purpose of this folder and why it appears there. Any information is appreciated. I also add screen shot for better understanding.

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