41815_1m_file2.xlsx «100% EXTENDED»

This format was introduced in Excel 2007 and is compatible with most modern spreadsheet software, including QuickBooks Online and Adobe Acrobat . Managing Large Files (1M+ Rows)

Modern .xlsx files are actually compressed ZIP archives containing multiple XML files. This format is safer than older versions because it cannot natively store malicious VBA macros.

Opening a 1-million-row file can often cause standard laptops to hang or crash. To handle this effectively, you can: How to open, read and edit an .XLSX file - Adobe