From crash reporting:

It looks like organizations can block the command line executable with something called "Device Guard". We should show the user a message rather than crash.

Your organization used Device Guard to block this app. Contact your support person for more info
  at System.Diagnostics.Process.StartWithShellExecuteEx(ProcessStartInfo startInfo)
  at System.Diagnostics.Process.Start()
  at System.Diagnostics.Process.Start(ProcessStartInfo startInfo)
  at Spaceketeer.Commands.OpenPromptCommand.Execute(Object parameter)