With simplier words: add an 'attach' icon in the message pane that informs about attachments in the current document.
svn path=/trunk/playground/graphics/okular/; revision=616780
m_topMessage->display(i18n("This document has embedded files. <a href=\"okular:/embeddedfiles\">Click here to see them</a> or go to File -> Embedded Files."));
m_topMessage->display(i18n("This document has embedded files. <a href=\"okular:/embeddedfiles\">Click here to see them</a> or go to File -> Embedded Files."),KIcon("attach"));