Duplicate Files in HTML Output

RoboHelp HTML 11

I did a lot of experimenting this week inserting Captivate demos into my project. Today, while trying to determine why my output is over 1 GB in size, I looked in the !SSL!\Multiscreen_HTML5\desktop folder.  I see many, many copies of folders related to these videos. There's a set with one timestamp containing "Video Topic 1", "Video Topic 2", etc.; there are many similar sets with different timestamps.

I should be able to delete all of these, right? Wont' anything that's still needed will be recreated when I Generate a new output?

Also, does anyone know why all these duplicates appear?

Thanks.

-- Shawn