Well, I had some success today, and this is what I tried.
First I imported the .html file containing my .swf file. This should work according to other sources, but it didn't!
Then in Lotus Notes I created an object (Microsoft PowerPoint Presentation) and inserted the .swf file in the PowerPoint object. Now I can see the first frame of the flash file, and with a double-click, the PowerPoint presentation plays my movie full screen.
The downside to it is, that my .swf file is 210KB, and my notes document is 6156KB.
FCiL