Zip archive, 734 MB, labelled as Microsoft Office 2007; the name does not indicate edition, language or whether a licence key is included. Office 2007 provides Word, Excel and related applications and can still open many older service documents, parts lists and spreadsheets. Microsoft ended support for this suite years ago, so it receives no security patches. Check the archive for tampering, scan it before installation and use it only with a valid product key for the edition.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @laptopschematics. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip