Thanks both but I wasn't clear.
I don't find my words in english, sorry.
I would like add in my plugins folder some default images (for ui).
Then, I would like construct 2 picks these images from my plugin folder and add them to the exported folder (and if it possible, when user preview his project too).
In fact, that's the same thing that dependency property does. It picks the dependency file and use it to preview/export.
If I'm not clear, I'll write a french message to Kyatric ;)