I'm not that familiar with Office release cycles (whatever the client/employer provides is what I use, or LibreOffice when they don't care). But I was reading Jira 2 exports to Word and Excel when that was the latest version, so you're looking at at least 10 years back...
They are not created in any version of Office at all. The export creates xml files that most versions of Office can read. There is no "compatibilty" with Office, the files are simply in a format that Office can open. (As for the 32/64 bit question, that really is utterly irrelevant - if you deconstructed an Office file saved in 32 or 64 bit versions, you would find no difference - the data in the files has nothing to do with how the programs are run)
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