Visual Studio HELP!!!!

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Ok, so I am working on web browser projects, but when I want to open a saved project, it only shows me the contents, (.exe, .vb files, etc.) and it will not open the project. If I click on the .sln, a gray screen will open, and the execute button will work, allowing me to run the project, but ONLY RUN, I can't edit. I think this is because I set Visual Studio as my default debugger, can anyone tell me how to change my default debugger, or make visual studio open my saved projects?