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.
@Greenbank started
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I'd stopped using Office when it was still xls. When did they add the extra x and why?