Whilst SolidWorks files can typically be exported to other CAD formats, this probably is not case for .slddrt files, which is just a template for new drawings and does not contain any CAD of its own. You need a finished SolidWork part or assembly for exporting purposes.
Convert SolidWorks general table template to AutoCAD DXF Drawing Exchange Format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert slddrt to dxf on Windows
A 2D and 3D CAD construction software
Convert from slddrt 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.