opening up .riv files in the editor

Hi! We have a lot of .riv files that need to be edited and accessed through the editor. Tried to drag the files into the rive editor, but i only recieve error message "Failed to upload [filename].riv". I saw somewhere that rive editor no longer support dragging in .riv files. Unfortunately we don't longer have access to the original files. Is there a way to get these to be .rev and editable again?