ZIP archive of about 5.6 MB named la22c350d1, which reads as a television model code; the name gives no detail on what is inside, so expect a service manual, schematic or firmware package and inspect the contents after extraction. If it holds schematics, a PDF reader is enough to trace the power supply, mainboard and backlight sections. If it holds firmware, verify it matches the exact model and board version and keep a backup of the original memory contents before flashing anything.
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 @datasheets1. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.