ZIP archive of about 33 MB named simply pack, with no model, board number or file type indicated. It could contain firmware, boardviews or schematics, so the contents must be inspected before use. Extract it and check each file for board numbers and chip names, then match them with the markings on the PCB being repaired. Treat any firmware inside as unverified until its size matches the flash chip, and back up the original chip before writing with a programmer.
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 @boardsscanrepo. 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