Dahua DH-XVR4A08 recorder archive of 14.6 MB in ZIP format, carrying the PCB code D1811 and board marking 41-209. It is most likely an SPI flash backup intended for restoring firmware on a unit that will not boot properly. Programmers such as CH341A or RT809H are typically used to write it. Check both codes against the board, save the existing chip contents before erasing, and confirm the dump size is correct for the flash fitted.
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 @laptopchiplevelrepair. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip