Firmware archive for the Panasonic TX-L42DTW60 television, main board TNPH1056 revision 1A, with an LC420EUD panel mentioned. At 112 MB it most likely contains a full NAND image, though the chip part number is not stated. Dumps of this size are used to restore software on boards that fail to boot, hang on the logo or reboot repeatedly. Identify the NAND on your board, use a programmer and adapter that support it, read and save the original contents first, and confirm the board revision matches.
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 @tvsoftwareworld. 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.