File used by Compucon's Embroidery Operating System (EOS), a program used to create embroideries and other patterns for Compucon sewing machines; contains a stitch pattern, including color, lettering, design patterns, stitch density, and size. XXX files may be loaded onto a sewing machine to automatically create embroideries. They may also be converted into formats usable by other types of sewing machines. NOTE: The file extension ".xxx" may also be used as a placeholder for a generic or undefined file extension.