I occasionally use a program called Camtasia to make short videos. Each time I create a new MP4 video, a second file of the type .swf is created which has the same filename with "_controller" added.
For example, if I create the following:
a second file:
1) What is the purpose of the .swf file?
2) If I want to share the mp4 file with someone (eg via Dropbox), do I also need to give them the .swf file in order for them to watch the video?