title: Start Visual Studio solution with a project unloaded
body: <p>Is it possible to start Visual Studio with a project unloaded (unavailable at start)?</p>
  <p>The reason for this is that, when starting, I often find that Deployment Projects often hangs for about a minute when starting, and they aren't used that often either.</p>
  <p>Setting these projects to unavailable and saving the solution doesn't make any change to project file, so if anyone has any suggestions on how to do this (either in Visual Studio proper, or through modifying the XML in the .sln file) I'd appreciate it.</p>
  <p>Thanks in advance.</p>
  <blockquote>
  <p>Edit: 2020-09-14: In the interests of keeping this question up to date, I have changed the accepted answer to the <a href="https://stackoverflow.com/a/58822561/31532">one by Johny Skovdal</a>. The gist of this is that Visual Studio now offers this ability built in (<a href="https://docs.microsoft.com/en-us/visualstudio/ide/filtered-solutions?view=vs-2019#solution-filter-files" rel="nofollow noreferrer">link</a>) via <code>.slnf</code> files.</p>
  </blockquote>