Affinity Designer document
AFDESIGN is the project file of Affinity Designer, Serif's vector illustration and design app. It holds curves, shapes, text, symbols, artboards and raster layers, so a design can be reopened and changed at any size. ToAny reads the preview picture Affinity saves inside the file, so what you get is Affinity's own render of the document, at the size Affinity stored it (up to about 512 pixels on the long side), not the layers or the full-size artwork.
Opens in Affinity Designer and Affinity 3; some other design tools can import it
AFDESIGN converter