RAR archive of 3.49 MB labelled SK105A.PB815 with a 1366x768 resolution and the tokens ir and 015. The name suggests firmware for a TV mainboard driving a 1366x768 panel, with ir probably referring to the infrared remote setup, though the archive should be opened to confirm. Such dumps are usually written to the board's SPI flash with a programmer or loaded by USB. Check the board model and panel resolution, and back up the original firmware before flashing.
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 @testedsoftwarefiles. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)