With the removal of the NPAPI plugins for 5.2 via 4c18af27bf95b332ee2006cfc0bbf469fb1a84d4 - there's currently no way to get to those embedded flash or pdf or whatever files from LibreOffice.
EasyHack therefor to add optional viewing functionality -
* see the aforementioned hash for where to stick this code in
* look at embeddedobj/source/msole/oleembed.cxx:839 for how to hand the file off to the sytem viewer
Migrating Whiteboard tags to Keywords: (difficultyInteresting, easyHack, skillCpp)
JanI is default CC for Easy Hacks (Add Jan; remove LibreOffice Dev List from CC)
Closing as this is no longer relevant.
When I right click on an embedded graphics and select "Edit with External Tool", I can open an embedded graphics via the system viewer.