EASM files (SolidWorks eDrawings) typically cannot be converted to any other CAD files, simply because these files in most cases generated as non-editable exports and not meant for further editing, which unfortunately means that easm to dxf conversion is unlikely. In case that you really need the original data, you have to get the source file from from the author and export that to DXF format.
Open EASM file Open DXF file