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Good point, I actually had a similar issue when opening a LibreOffice file in Word. I think that's more just the problem with having one standard for everything. That said, FOSS projects do need to work toward total compatibility with closed-source projects if they want to have a fighting chance of dominating the market. If LibreOffice really could just be a drag and drop replacement for MS Office, I don't think anyone would choose to use MSO.