Assembly-CSharp-Editor.csproj could not be loaded - Because it doesn't exist

Hi everyone!

So I was very excited to see Unity 2018 get it’s first official release, I had tried the beta a month or so back and had this exact same problem I’m having right now with the non-beta version. I looked around and couldn’t find anyone else having the same issue, chalked it up to it being a beta version issue, and went back to the previous 2017 release to continue my work.

The problem occurs when I try to open any of my scripts in Visual Studio 2017 (v15.6.6). Visual Studio tries to open two C# project files alongside the usual project and solution files, however, they don’t exist. The two files are Assembly-CSharp-Editor.csproj and Assembly-CSharp-Editor-firstpass.csproj. Because these two files don’t exist, and VS really wants them to, I don’t get ANY intellisense, and all of my scripts are considered miscellaneous files.

If anyone has any ideas at all how to fix this, I would really appreciate the help!

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Go Edit → Preference → External Tools and set External script editor as VS2017.
It might be set as Open by file extension as default.
I had same problem at first time install of Unity 2018

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