The first DOCX demo looked great. One page. One font. A small table. No headers. No section breaks. I thought the hard part was done. Then a customer sent a real contract. It had missing fonts, nested tables, merged cells, numbered clauses, headers, footers, page breaks, and a signature block that had to stay in the right place. Our clean demo became useless in seconds. That failure changed how I think about Office preview. A file that opens is not a file that renders cor...