Small RAR archive of 1017 KB named simply 1280, with no device, brand or board number in the title. The number alone does not reveal the model, so the contents must be opened to determine what equipment it serves and whether it holds a schematic, layout, firmware or notes. Material of this kind is used to trace circuits, find components and test points or reflash memory. Extract it with 7-Zip or WinRAR, identify the target device and check that the PCB revision matches before working from it.
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 @tamirat_moobile. 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.