OFM is the extension of files used by Melco embroidery machines. OFM files store an embroidery pattern in the form of a set of control instructions for the machine to obtain a particular embroidery on a fabric. The maximum number of colors in an embroidery with this file format is 10.

OFM files can be generated by converting image files such as JPEG, PNG, and GIF. Each of the companies in the machine embroidery industry most often uses their own embroidery file formats and they are rarely compatible with each other.