When you click an InfoPath form from the workflows settings page in SharePoint Designer 2013, you receive the following message:
To open this file, you must first install Microsoft InfoPath 2013 on this computer.
Microsoft has a released a fix for this issue. You can download this fix from the following Microsoft websites:
For x64-based systems
For x86-based systems
ID articolo: 2804405 - Ultima revisione: 29 dic 2016 - Revisione: 1
Microsoft Office SharePoint Online