RAR archive whose Russian name translates roughly as your salvation. It gives no device, board or content type, so the file name is uninformative. It is 2.28 MB, a size consistent with a small set of schematics, a tool or firmware snippets, but that cannot be confirmed from the name. Extract it with WinRAR or 7-Zip and look at what it contains before use. Scan any executables for malware, and do not flash any firmware without first confirming it matches your exact device and backing up the original.
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 @uzb4422. 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.