Archive for an ITX motherboard labelled ITX-N2840T-1CD82L, 5.76 MB as a RAR, with the name suggesting a mini-ITX board built around the Intel N2840 processor. The contents are not described, though the size is typical of a BIOS image and related files. Extract it and check what is inside before using it for repair. If it is firmware, read and save the original SPI chip with a programmer before writing anything, and confirm the image size matches the flash capacity. Match the board marking on the PCB exactly to this name.
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 @hrtechno. 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.