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by happymellon 894 days ago
This is also true of DOC. It was just a dump of the internal representation of Word.

Hence why they had to completely overhaul it with DOCX/XLSX when we had the open standards requirements come in. There was no possible way for Microsoft to document it. Although it doesn't help that DOCX/XLSX have tags for "Internal binary dump of Word/Excel" so they also fall into the same trap.