Calling all communication design nerds.

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Does anyone know how to change an InDesign CS4 file over to a CS3? What happened is, i did a magazine layout for my typography class on the InDesign CS4 30 day trial i downloaded on my computer. Then when I brought it into class the next day the InDesign CS3 that is on their computers will not allow the CS4 plug-ins. I've tried change changing the file to .inx along with every other file name changing you could think of and i know preflighting would work but i don't all of those programs yet. Any help or suggestions would be much appreciated. Thanks :)