Visual Studio 2015 resetting web project to use IIS Express

Question

I have a web project in VS2015 that I want to run on Local IIS. I set this up in the project properties and it works correctly, but whenever I close and reopen Visual Studio it always resets the project to use IIS Express.

EDIT: this happens when I close and reopen the solution, even if Visual Studio has stayed open.

Why is this happening, and how can I change it? (Note - other users are working on the same project so I don't want to store my Local IIS settings in the project file as I assume this would overwrite their settings when they got the latest version of the code.)

Answer 1

I edited the .csproj.user file and this fixed the problem. I changed <UseIISExpress>true</UseIISExpress> to <UseIISExpress>false</UseIISExpress> and left everything else the same.

I still don't know why doing this through the UI didn't save, if anyone else can explain it I'll happily accept their answer.