[File] Mark OOXML as zip archive data

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Hi,

I am emailing to request a change in the entries for Office Open XML files.

Because they are all just zipfiles (see 
https://support.microsoft.com/en-us/powerpoint/extract-files-or-objects-from-a-powerpoint-file 
and https://en.wikipedia.org/wiki/Office_Open_XML), I believe that it 
would be a convenience to add "Zip archive data" to their names.

Thanks in advance,
cutepower3000