Cannot find custom tool on this system, even though it is there
<p>I'm trying to use an in-house custom tool that generates <code>C# code</code> from <code>XML</code> in <code>Visual Studio</code>.  </p>

<p>The last time I successfully used the tool was about a month ago, since then I've updated from <code>Windows 8.1</code> to <code>Windows 10</code> and have also updated <code>Visual Studio 2015 from Update 2 to Update 3.</code>  I have colleagues who were using Windows 10 and Update 3 before they installed the tool for the first time and there are no problems finding the tool for them.  </p>

<p>There have been no changes to the tool made since updating Windows and Visual Studio.</p>

<p>When I tried to use it today I'm seeing the error </p>

<blockquote>
  <p>"Cannot find custom tool on this system".  </p>
</blockquote>

<p>I've tried uninstalling and reinstalling my tool, as well as calling <code>devenv /setup</code>, as well as deleting and readding the extension gallery for my custom tool.  I've also tried repairing Visual Studio, to no avail.</p>

<p>I've checked the registry and I can see the key for the tool there.</p>

<p>Has anyone else experienced the same issue, or got any suggestions for other things I can try?</p>

<p>Thanks a lot!</p>