Android application package for KineMaster Pro, version 4.15.9.17782, a 78.8 MB installer file. It is a video editing app, not a schematic, boardview or firmware dump, and it has no relevance to motherboard diagnostics or flash chip programming. An APK installs on Android phones and tablets once installing from unknown sources is allowed, and it can also be opened as a zip archive to inspect its contents. Files from outside official stores should be scanned for malware before installation, and modified versions may break or carry unwanted code.
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 @esquemaseletricos. Enginerys does not host this file.