Compressed archive tied to the Lenovo mainboard NM-A272, a board code in the Compal / LCFC numbering pattern used for many IdeaPad and ThinkPad designs. The name does not state whether it holds a schematic, a boardview or a BIOS image, so open the zip and check before relying on it. At 1.67 MB it is small enough to be a boardview or firmware dump. Whatever the contents, compare the NM number and revision silkscreened on the PCB with the files inside, since neighbouring NM codes often belong to completely different laptops.
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 @schematiclaptopramkushwaha. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.