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Ten years ago people were still complaining about OOXML not being an open standard. Don't worry guys, I'm sure they'll make a reference implementation of the standard soon! I'm sure there were a few people waiting around for a "real" standard to come out before implementing XLSX support.

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It was submitted for standardization in 2006: https://en.wikipedia.org/wiki/Office_Open_XML.

At that time the was less information about 97-2003 file formats (OLE2-based), but it was fixed around 2008-2009: https://alexott.blogspot.com/search/label/file%20formats

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