You can already embed any type of file in a Scrivener project (ensure “Import supported file types only” is unticked in the “Import & Export” preferences) and then use the “Open in External” editor feature to open it and edit externally. Or do you mean something different? The latest beta ( https://forum.literatureandlatte.com/t/scrivener-2-x-update-betas-download-here/11262/1 ) also has a File > Import > Research Files as Aliases feature if you don’t want the files to become part of the actual project.