title: visual studio 2019 open solution file incompatible
body: <p>I think I was using visual studio 2017 and wrote a SSIS package. Now I installed visual studio 2019 and can't open the solution file. Error:</p>
  
  <blockquote>
    <p>Unsupported This version of Visual Studio is unable to open the
    following projects. The project types may not be installed or this
    version of Visual Studio may not support them.  For more information
    on enabling these project types or otherwise migrating your assets,
    please see the details in the "Migration Report" displayed after
    clicking OK.
       - ABC, "C:\Users\XYZ\ABC.dtproj"</p>
    
    <p>Non-functional changes required Visual Studio will automatically make
    non-functional changes to the following projects in order to enable
    them to open in Visual Studio 2015, Visual Studio 2013, Visual Studio
    2012, and Visual Studio 2010 SP1. Project behavior will not be
    impacted.
       - ABC_SSIS, "C:\Users\XYZ\ABC_SSIS.sln"</p>
  </blockquote>
  
  <p>I tried "Right-click on the project and reload" - didn't work.</p>
  
  <p>I tried to confirm SSDT is installed:
  it is installed at the installation interface, but doesn't exist in extension manager:
  <a href="https://i.stack.imgur.com/SC5xS.png" rel="noreferrer"><img src="https://i.stack.imgur.com/SC5xS.png" alt="installed SSDT"></a></p>
  
  <p><a href="https://i.stack.imgur.com/EMMFZ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/EMMFZ.png" alt="no SSDT in extension manager"></a></p>