Android application package, version 1.1.0, whose Chinese name translates roughly as Little Apple Video TV edition, a media player app for Android TV boxes or smart TVs. It is software, not a schematic, boardview or firmware dump, and has no link to a specific motherboard. The 15.2 MB APK installs by sideloading on an Android device with unknown sources allowed. Treat third-party APKs with care: scan for malware and test on a non-critical device first, since such apps are often unsigned or unofficial builds.
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 @tv_software. Enginerys does not host this file.