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My post about making docx files compatible on older MS Office installations makes use of web services or online converters to achieve file extension adoptability on older systems.
This post however will do us otherwise a big favor of keeping MS Office 2007 files compatible with older MS Office applications by simply installing Compatibility Pack for the 2007 Office System.
This move would eventually make all files generated by the Office 2007 usable on say for example MS 2002 install.
So, if you gave a docx file that you’d want to open on a 2002 MS Office application, you can actually do it.