c# not readable in my unity 2018

now I am in a course and my instructor posted a solution which is a c# file, it is not readable in my unity

the solution file is not read in my unity browser so I decided to drag it


and i clicked it and it did not open either while my classmate posted this screenshot below where he can easily read the file in his unity

I don’t get it please help me

You’re not supposed to throw the solution in there, just the scripts.

A C# project consists of a bunch of .cs files, as well as the .csproj files and a .sln file that defines which of those .cs files goes together how. In Unity, what files go together are defined by the folder structure, so both the .csproj files and the .sln files are auto-generated.

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thank you I get it now