You can simple open a file in office 2010 and then click save as, and select the office 97-2003 and it will work for you.
To avoid this confusion, and other such format confusion in MS Office, my personal advise will be to convert your important files to PDF, so that they can easily be read and accessible so that you dont have to change the formats again and again. You can try many PDF Converter available over the net, I personally has experience of ClassicPDF converter and adobe. Adobe is a expensive comparatively while the ClassicPDF will work for you. You can have the trial of both by searching them in Google of looking for them in CNET. Hope that will make it things easy for you.
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