Android application package whose Chinese name translates roughly as TV desktop member edition, version 1.2, size 15.1 MB. It appears to be a launcher or home screen app for Android television boxes or smart TVs, not a firmware image or repair document. APK files install through the Android package installer, usually after enabling installation from unknown sources, or via adb. Verify where the package came from and scan it before installing, since modified APKs of this kind can 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 @tv_software. Enginerys does not host this file.