I was using Visual Studio 2015 Professional and recently switched to Visual Studio 2017 Enterprise, as required by my job. The new version of VS won't open my tds projects. It says "This version of Visual Studio is unable to open the following projects. The project types may nto be installed or this version of Visual Studio may not support them." The detail in the migration report says "The application which this project type is based on was not found."
I downloaded and installed Team Development for Sitecore Classic 5.7.0.12, and I tried repairing my VS 2017 installation including .NET Framework 4.6 and 4.7.1 development tools, but the problem persists.