SWF not working if moved

Hi guys!

I have a small SWF that works if I run it in FlashDevelop or when I run it (by double clicking) it from the bin folder. Now, if I move the bin folder anywhere else, and then double click on the SWF, it runs, but is missing the .pngs.

The folder structure is: bin contains .swf
bin/assets/imges contains .pngs

I copied the whole project folder to another place, but still, the same problem occurred.

What do you think might be the problem?