Embroidery designs for Orchida machines (.emb) can be exported to their Tajima equivalents (.dst) with programs such as Orchida Embroidery System, Conver It, Mac or similar.
Nevertheless, there may also exist other embroidery designs formats other than Orchida that use emb suffix, so you may need a specific software for certain .emb files. In any case, emb to dst conversion is likely doable.