Saving assembly from Solidworks 2009 to SolidWorks 2007

Hello everyone,

I have Solidworks 2009, but I would like to save my assembly and it's parts as Solidworks 2007. How can I do it? There seems to be no option for that.

If there's no option for that, then what format is best to save in for a person to open it in Solidowrks 2007?

Thanks alot in advance!SolidworksImport export