I'd stopped using Office when it was still xls. When did they add the extra x and why?
xls is a proprietary file format xlsx is xml (but still contains a load of proprietary nonsense).
I've just opened one and it looks like it's zipped. Not a very friendly XML doc if it's compressed.
Well, yes, it's a collection of xml files in a zip file. That's pretty standard shit nowadays and on the other side uncompressed verbose file formats are quite rare.
@hippy started
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xls is a proprietary file format
xlsx is xml (but still contains a load of proprietary nonsense).