An archive of repair files. Shared as “rd8503pa672 regu1280 1024ok soft premkumar.zip” — a .zip file, 222 B.
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 @led_software. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip