\useMPlibrary[dum]

\starttext

    \externalfigure
      [mediashow.swf]
      [background=figure:comment,
       comment={Alas, we have no nice preview}]

    \externalfigure
      [mediashow.swf]
      [background=figure:dummy,
       comment={Alas, we have no nice preview}]

    \externalfigure
      [mediashow.swf]
      [background=figure:dummy]

    \typefile{dummies-001.tex}

\stoptext
