opening future files in older solidworks
5 Answers

convert future solidworks file in step/IGES format and open it in older version.
Save as .step formet. .step and IGES file are supported in any software any versions.
.step extension is better than .iges .

If you do not have access to the newer version, you will not be able to open the file. It will have to be converted to another file type (.step/.iges) in order for you to be able to open. If the file is from GrabCAD ask the author to convert it and upload a universal file type.