Dahua DH-XVR5108HS 8-channel recorder archive, 14.4 MB ZIP, labelled with the board code 55_101. It most likely holds a flash memory backup for reviving a unit with corrupted firmware, endless reboots or a freeze at the logo. Write it with an external programmer after reading and saving the existing chip contents. Make sure the 55_101 marking on your board matches and that the dump size corresponds to the flash capacity before programming.
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