A 71.8 MB ZIP for the Dahua DH-XVR4B08 recorder, labelled with the board code 41_206. Contents are likely a flash dump or firmware set used to bring back a recorder that fails to start or hangs on the logo. Inspect the archive before use, then compare 41_206 with the markings on your PCB. Read the current flash with a programmer as a backup, and write only an image whose size matches the installed memory chip.
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