Steps:
1. Open Editor
2. In Edit/Preferences/External Tools select 'Open by file extension' as the External Script Editor
3. Download and open in the editor the attached project "1_RunningTest_Project.7z".
It contains two assemblies - Test1 is a test assembly for MyExercise and has a correct assembly definition reference to the it, as can be seen in the import settings of Tests1.asmdef
4. Select Open C# project from the menu.
Result: File explorer opens at the project folder, sln and project files pop into existence.
5. Open the sln manually. Notice errors into MyMathTests.cs - it does not recognize the types from MyExercise.

Expected result: No C# projects gets generated. Project files should only be generated by package implementations when Visual Studio or Rider, etc. has been chosen in the External Tools menu.
When Pressing Open C# Project it should open folder.

Actual result: incorrect C# projects gets generated.