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VSConstants.LOGVIEWID_Primary Field

GUID_VSStandardCommandSet97 cmdidOpenWith handlers should pass this value to OpenStandardEditor method to get the Open With dialog, in this case the default/primary view of the editor factory.

Namespace:  Microsoft.VisualStudio
Assemblies:   Microsoft.VisualStudio.Shell.12.0 (in Microsoft.VisualStudio.Shell.12.0.dll)
  Microsoft.VisualStudio.Shell.14.0 (in Microsoft.VisualStudio.Shell.14.0.dll)

public static readonly Guid LOGVIEWID_Primary