Archive for the Lenovo ThinkPad T450s, about 12.2 MB, with no description of its contents in the name. Packages of this size for the model commonly hold a schematic, a boardview or BIOS images, so extract it and identify each file before relying on it. Schematics help trace power rails and signals, boardview files locate parts and test points, and dumps are written with an SPI programmer. Match the board number printed on the PCB to the documents inside.
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 @hrtechno. 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.
7-ZipWinRARThe Unarchiver (macOS)