Kupluk, maybe a better question to ask is WHY you want to place a swf in a dll? What are you hoping to accomplish?
Also, don’t bash yourself too hard: everybody here had to start at the beginning, learning AS. Sure, some catch on quicker than others (I’m a slower one, for sure) but it’s a matter of patience and practice. It could be that what you’re trying to do is out of your reach right now, but as you learn Flash and AS, you’ll grasp it in time.
I guess if you only rename the swf to dll or anything else (except to extensions that are loadable in flash, like mp3 or jpgs) and load it to the main movie, it should work. Or at least it worked for me. Another solution is if you want to hide your files:
-create a 3rd party tool which does some changes to the swf (like simply zips it and changes the extension by renaming)
-if you want to load the movie from the main swf, execute the tool which does a copy of the file unpacked
-use the unpacked swf in your movie
-delete unpacked swf, exit 3rd party tool
I’m not sure if it would work all the time, because of Flash’s security restrictions, and finding a temporary folder to unpack the files might work wrong as well - but still, this is prolly the only way