I have a Silhouette and making your own cut files from an appliqué design is very simple - at least I know it is when you have the design file in the digitising software. I have not tried to get one from an embroidery file.
The Brother websites in USA & Australia include the files for the ScanNCut in their designs. Look in their free section.
LindeeG includes the ScanNCut and another cut file in her applique designs too that she has for sale.