If the SolidWorks eDrawing file (.easm) wasn't locked by the creator, it might be possible to convert easm to stl (or any other supported 3D model format) it using SolidWorks or some 3rd party alternative, such as SketchUP Pro with the help of some plugi
Other than that, you need to contact the original supplier of the eDrawing file and ask him to export it to some other format from the original source. It is unlikely some program designed exactly for the purposes of easm to stl conversion exists.