WebP-wrapper

[Maveri55]

I tried the example attached to the WebP-wrapper project, (Webp-wrapper-master) using Visual Studio; well it works.

I decide to create a new project to check, I add WebpWrapper.cs to the new project.

problem: I can't add libwebp_x86.dll and libwebp_x64.dll to the references (Visual Studio reports * can't add a reference to libwebp_x86.dll verify that the file is accessible and that the assembly or COM component is valid

It also occurs if to the example attached to the project I delete the dlls from References and try to add them again.

I need help figuring out how to add the DLLs to References.