public void DoCommand(object commandTag) { var docTag = commandTag.As <HelpDocumentTag>(); if (docTag == null) { return; } try { SledUtil.ShellOpen(docTag.File); } catch (Exception ex) { SledOutDevice.OutLine( SledMessageType.Error, "SledAboutDocumentService: Exception " + "opening doc file \"{0}\": {1}", docTag.File, ex.Message); } }