# CS4 projects not able to be viewed in CS3

**URL:** <https://forum.kirupa.com/t/cs4-projects-not-able-to-be-viewed-in-cs3/293700>\
**Category:** flash\
**Created:** [August 2, 2009, 12:01am UTC](https://forum.kirupa.com/t/cs4-projects-not-able-to-be-viewed-in-cs3/293700 "2009-08-02T00:01:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Snivvle](https://avatars.discourse-cdn.com/v4/letter/s/edb3f5/32.png) [@Snivvle](https://forum.kirupa.com/u/Snivvle)\
**Post date:** [August 2, 2009, 12:01am UTC](https://forum.kirupa.com/t/cs4-projects-not-able-to-be-viewed-in-cs3/293700/1 "2009-08-02T00:01:15Z")

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I don’t understand why. I downloaded CS4 and created several projects, but then the 30 day trial period ended. When I opened up my licensed CS3, and tried to open the projects I created in CS4, they didn’t open. I don’t understand why Adobe would do this, unless they didn’t, and I am missing something simple? I can’t believe it is not backward compatible?