You cannot open "part3" alone. You must download all parts (part1, part2, etc.) and place them in the same folder before using a tool like WinRAR to extract the final .bin file.
Ensure your TV screen actually supports 1920x1080. Installing Full HD software on an HD-ready (1366x768) panel can result in no display or a distorted image. Download SP35851 1920x1080 MEPL India part3 rar
Technical communities often share these files in multiple parts (like "part 1", "part 2", "part 3") because firmware files can be large, and splitting them makes downloading easier on slower connections. You cannot open "part3" alone