Numerically named RAR archive, 108, with a size of 7.09 MB and no indication of device, brand or contents in the name. The larger size suggests it could hold firmware files or a set of service documents, but that has to be confirmed by unpacking it. Before applying anything from it, match the model and hardware revision of the unit on your bench, and make a full backup of the existing firmware so a failed or incompatible write can be reversed.
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 @Schematics_Mobile. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)