Well, I've been searching for a while around the MSDN documentation, questions here and other sites and even some books but I can't find any clear reason why there isn't any information about how to develop Add-Ins (VSTO) for SharePoint Designer 2010 and recent versions.

The little info I've found about it is from the book "Professional Microsoft Office SharePoint Designer 2007" which has a chapter about developing an Add-In to export Workflows and open them in Visual Studio, but the authors state that Microsoft doesn't support these officially.

Even knowing that, the authors create the Add-In using an unofficial template for the creation of the Visual Studio solution. So my question is:

It is still possible to develop a SharePoint Designer Add-In for versions upper to 2010?
If so, there is any available template that can be used to create the VS project?

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    You want to built something (an Add-In) for SharePoint Designer itself, or do you want to develop A Add-In Using Designer? – Danny '365CSI' Engelman Jan 9 '17 at 10:19
  • I want to built something for the SharePoint Designer itself. The terminology for Add-Ins and SharePoint sometimes gets tricky for me. – ELKOKACOLO Jan 9 '17 at 13:36
  • Microsoft is clear SPDesigner has no future. SPD2013 works in 2016 and Online... for now. So I wouldn't built a business on extending SPD. You can use VBScript to write anything on top of it.. But indeed hardly any documentation. – Danny '365CSI' Engelman Jan 9 '17 at 16:15
  • I'm aware of the no future of SPD, but since I have to work with it in my projects I'm searching all the little possibilities to extend its functionality to improve my personal experience using it, like adding a text beautifier o including other editor features for example. Seems I won't have any luck with this. Thanks anyway! – ELKOKACOLO Jan 9 '17 at 17:12
  • Could be my "You can use VBScript" labels me as a dinosaur.. last time I did that was in SPDesigner 2007 ... – Danny '365CSI' Engelman Jan 9 '17 at 18:06

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