there is no application set to open the document microsoft.dynamics.ax.framework.workflow editor host(8).application
Installed product version: Microsoft Dynamics 365 for Finance and Operations (8.1)Installed platform version: Update23 (7.0.5126.35370)
Well looking at the screenshot, it looks like MAC OS.
Suggested to use IE,
Click on ID
Enter your email id and password:
Done Workflow editor will open: