Android application package named mytv for Android TV, version 2.2.4, built as an all-architecture package with sdk21 in the name, meaning a minimum of Android 5.0 (API level 21). The file is a compact 4.78 MB APK intended for TV boxes and smart TVs running Android. It can be installed by sideloading from USB storage or with adb install when setting up or refurbishing a box. Check the Android version of the device first, and remove older conflicting builds if installation fails due to signature mismatch.
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.