Archive labelled for the Lenovo ThinkPad T14 Gen 2 with an 11th generation Core i5 processor; the name does not say what the 47.5 MB rar contains. It may hold BIOS dumps, EC firmware, a schematic or boardview, so open it and review the contents before relying on anything inside. When using firmware from such a package, match the machine type and mainboard number to the unit on your bench, dump the original SPI chip as a backup, and confirm the image size equals the flash capacity before programming.
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 @laptopschematics. 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.