Is there any way to open solidworks 2011 files in Solidworks 2010?
The only way is using a Parasolid format, STEP or IGES.
The other way is to install a copy of newer version along the 2010, then, open the 2011/2012 version and save as parasolid and open in 2010, but I advise strongly against doing so. To make it work, you'd need a separate partition with a separate OS with a proper standalone SW installation. That means dual boot.