I have made a github repository:
https://github.com/prof7bit/NativeDragDrop

I have renamed it because I plan to also make it work with more than only files (I have already added text/plain format), so ts not strictly only a "file" drag source anymore, therefore I renamed it and I also plan to add a drop target component later, so they could completely replace LCL internal drag&drop (because LCL DND cannot work for the same component at the same time if the native DND is active, so the best thing would be to use native DND for internal dragging too).