Large 878 MB RAR archive whose Portuguese name translates roughly to video testing a TV power supply board. It appears to hold a video recording of diagnostic work on a television PSU board, not a schematic or firmware. The name gives no TV brand or board model, so the content can only be judged after extraction. Material like this can show measurement methods for standby voltage, PFC and main rails. Discharge the primary capacitors before working on any live power board.
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 @oficinacomputadores. 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.