Lenovo IdeaPad Y460 archive, 940 KB in RAR format, tagged KL2D, which looks like a Quanta-style project code, though the name does not name the maker. Contents are not specified, but such packages usually contain the mainboard schematic. It helps with checking power rails, signal routing and the location of components when chasing a short or a no-power fault. Extract it with 7-Zip or WinRAR and compare the code on your PCB with KL2D and the revision in the documents before use.
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 @schematicslaptop. Enginerys does not host this file.
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The same file was posted more than once. If one link is dead, try the next.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.