NVR firmware archive of 13.9 MB whose name gives no model, version or hardware details, so the contents must be identified before use. It most likely holds an update package or flash image for a network video recorder. Technicians use such files for TFTP or USB recovery, or for direct SPI programming of a recorder that no longer boots. Compare the main board markings and the SoC with any notes inside, and dump the original flash chip before writing anything.
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 @vinafix_bios. 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.
7-ZipWinRARThe Unarchiver (macOS)