Recovery archive for the Dahua DH-XVR5116HS, 14.9 MB in ZIP form, with board identifiers 41_111 and D1621 given in the name. The content is probably an SPI flash backup for reprogramming a recorder that will not boot or shows a frozen logo. Technicians write such dumps with an external programmer such as RT809H or CH341A. Compare the PCB code and version marks with the name, save the existing chip data first, and verify the dump matches the flash size.
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