This API is too limited in my opinion. In general, one needs at least a coordinate relative to the window and to receive updates when this coordinate changes. In my tests on X11, the app does not receive usual cursor or touch events when a file is hovered, hence the window has no way of determining the current coordinate.

Suggestion: add a "source" parameter to DroppedFile, HoveredFile, and HoveredFileCancelled, and continue to deliver cursor and touch events as normal.

Alternatively, include a coordinate and add a HoveredFileMoved event.

(I have not investigated platform capabilities and don't have a direct use, but wish to add support to KAS, which must determine the widget under the drop.)