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.
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.