Repair archive for the HP Stream Notebook 11-r020tu, tied to motherboard DAY0HCMB6B0. That number follows the Quanta DA/DAY pattern, so Quanta is the ODM behind this HP board. The 3.40 MB RAR does not list its contents in the name, and could hold a schematic, boardview or BIOS image. Unpack it and check the file types inside. Before using any of it, compare the board number and revision silkscreened on the PCB with the label here, since Quanta reuses platforms across several revisions.
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.