The file appears to be a large-scale Microsoft Excel dataset, likely part of a series (indicated by "File2") containing approximately 1 million rows of data (denoted by "1M").
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) 41815_1M_File2.xlsx
While the specific proprietary contents depend on the source it was downloaded from, files with this naming convention are frequently used for: The file appears to be a large-scale Microsoft