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by int_19h 2758 days ago
There was certainly some format that Word and Excel used before compound files, since COM Structured Storage only appeared in 90s, and the first version of Office to use it was (IIRC) Office 97. That older format may well be some kind of a memory dump. But I don't think there are many Office files still floating around these days, and most third party software that works with them seems to assume that it's 97 or later.