how to open a file solidworks 2013 on solidworks 2012?
You can not open the parent version file in the previous software version.
( if not sp5 last versiyon ! ) Generally, file formats with different extensions such as iges, sat, etc. are accepted. In such a case you can not change the 3d drawing, it is difficult.
you can convert it to step file...then you can open your object with solidworks 2012. at this moment you don't have feature in history. to get the feature you have to go t o insert> feature works> recognize feature....then select the features you want and bring it
I think it will help you to get the features in history.