ZIP archive named L55P2MUS, 2.51 MB, with no description of its contents in the name. The code resembles a TV model designation, so it most likely holds service data such as a schematic, firmware or board files for that set, but this must be checked by unpacking it. Once identified, use the material to trace power supply and mainboard faults or restore firmware. Compare the model label on the back cover and the board part numbers inside the set with whatever the archive contains before relying on it.
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 @gunvantrathore. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.