If you have a file with an .xlsx extension on the file name that was last edited by Microsoft Excel, then the file is stored in an Office Open XML (OpenXML) zipped, XML-based file format developed by Microsoft for spreadsheets, charts, presentations and word processing documents. You can change the file extension to .zip by renaming the file. You should then be able to extract the contents of the zip file as you would with any other zip file.
There are different algorithms that can be used for storing files within a
zip file that determine the level of compression and speed of production of
a zip file. If you are using a
Linux or
Apple OS X
system, you can see choices that are available for compressing files and
directories into a zip file from the
command line, e.g. from a
Terminal
window on an OS X system, by looking at the
man page
for the zip program by
issuing the command man zip.
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