See 1 of each block All Videos page

Add a swf link in HTML4
  http://s5.hotdoodle.com/formattest_2014_06/files/test_video/Test_Video2_SWF.swf

Watch it play

Set to html5, watch it play

set it back to html4.  It should still play

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Do not upgrade FLV or swf files -- we have none in production