Creating Excel file via Coldfusion and XML leads to large file size

I have created an excel file with XML and ColdFusion.  This is a very large file with multiple sheets.  When I download this file it is 70 MB in size.  Is there any way to reduce the size of this file?
ppiTechAsked:
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nociSoftware EngineerCommented:
Why not zip it.  Effectively an .xlsx file not not a lot more then a .zip file with several XML documents with specific names & function inside.
Same for ODS, word documents (new style) etc.
Due to a lot of fixed strings (for tags)  the files do lend perfectly for compression.

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