You have CS3 and want to open CS6 files? Is that correct?
If so, the CS6 user will have to export IDML. That file will need to be
opened in CS4 and exported to INX for CS3.
Don’t count on that file working correcting or looking like it should.
It’s time for you to think about upgrading.
Thanks think I'll have her find a 5.5
[Personal info removed by moderator]
Even if you can find a legitimate CS5.5 license, it also can't open CS6 files....