how to working the fils solidwork new or old version
2 Answers
Old versions aren't a problem; they can all be opened.
Future versions aren't the same; you can't open them in previous versions.
You'll have to convert your files into a universal extension - like STEP - then open them in your current version.
Check this discussion too:
https://grabcad.com/questions/how-to-open-a-solidworks-future-version-file