eDrawing files (.easm) cannot be converted to anything else, simply because they are used as previews and for printing - not for further editing. Somewhat similar to PDFs in their use, but used for CAD designs.
If you need the model exported to other 3D modeling / CAD format, for example ISO STEP product data (.stp, .step), you will need to obtain the original source from which the eDrawing file was exported in the first place. Otherwise easm to step conversion will be impossible to achieve.
Note: Some .easm files are exported with the option 'allow save' which apparently allow for some basic export to other formats, for example STL.