Very large 7-Zip archive of 1.61 GB whose Russian name simply means schematics, so it gives no hint of the brands, models or boards included. The size suggests a broad collection of circuit diagrams, probably for many devices. You need 7-Zip or a compatible extractor, and enough free disk space for the unpacked files. Once extracted, match each document to your board by the number and revision silkscreened on the PCB before using it to trace power rails, signals or shorted lines.
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 @opendatasheet. Enginerys does not host this file.
How to open a .7z file
High-ratio compressed archive, often used for large BIOS collections.
7-ZipWinRARKeka (macOS)