The project type is not supported by this installation
问题 Whenever I try to open a project (csproj) that's downloaded from the internet, most of the times, I get the "The project type is not supported by this installation" It appears that my Visual Studio installation is not corrupted (I can pretty much do everything with it other than open these csproj files) What may be causing this? 回答1: edit please see the answer further down, which is about 18 months newer, and actually solves the problem. This historically once-accurate answer is no longer as