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Thread: Microsoft Office save XML zipped files

  1. #1
    Member BetaTester's Avatar
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    Dec 2010
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    Exclamation Microsoft Office save XML zipped files

    Most office backups, are compounds by Microsoft Office files type, as docx and xlsx.

    These files are zipped XML, a standard save similar to the OpenOffice.

    For example, testing 7zip "PPMD 1024MB word32", Rar "Best", and FreeArc "-mx" in my doc.

    LTT2 expand-----148.195.235 bytes
    LTT2.docx----------4.322.991 bytes
    LTT2.docx.7z-------4.311.135 bytes
    LTT2.docx.arc------4.304.844 bytes
    LTT2.docx.rar-------4.288.586 bytes
    LTT2expand.rar----2.224.025 bytes
    LTT2expand.7z-----1.128.672 bytes
    LTT2expand.arc------867.204 bytes

    Expanding file and the recompressing, can be increased compression.

    In the case of backups made ​​in offices, consisting of thousands of Microsoft Office files, this procedure greatly reduce the size of backups.
    Last edited by BetaTester; 13th July 2012 at 22:06.

  2. #2
    Join Date
    Jun 2009
    Puerto Rico
    Thanked 60 Times in 46 Posts
    I did a research on this a long time ago and I came to the same conclusion as you. In my case, I unzipped the docx and pptx and then compressed them with PAQ. Then, to restore the file I would extract the PAQ file then compress it with ZIP file.

  3. #3
    Member m^2's Avatar
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    Sep 2008
    Ślůnsk, PL
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    It's a well known fact. I did a detailed benchmark some time ago and came to conclusion that 4x4 was faster and way stronger than the default, though my dataset was less than perfect. I think the benchmark should be available somewhere on this forum.

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