.swf files can be opened by Shotcut when I use it on Windows 10, version 17.01.02 however there is no usability other than previewing the animation, and it cannot be exported or modified/added to a playlist or timeline. Basically no, not from what I’ve seen. Where did you see swfdec library?
Also, know that submissions to the forum do not need to be approved and you can just create a topic without asking for approval. And please don’t thread bump too much.