eDrawing files (for example .easm) cannot be converted to anything else, because they are used as previews and for printing - not further editing. They are similar to PDF in their purpose. You have to access the original assembly files if you hope for export of any kind, including the one to STEP format (.stp, .step).
Convert SolidWorks eDrawing assembly data to ISO-10303 STEP product data.
We found one software available in the database for this conversion.
Microsoft Windows software - convert easm to stp on Windows
A 2D and 3D CAD construction software
Convert from easm file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.