Small ZIP archive of 583 KB labelled with the Samsung model code SM-T585, a Galaxy Tab A 10.1 LTE tablet variant. The name does not say what is inside, but at this size it is likely a compact schematic or a set of service diagrams rather than firmware. Material like this helps when tracing charging and display circuits, finding fuses and test points, or isolating a shorted line on the logic board. Compare the board revision printed on the PCB with the document before replacing parts, as Samsung revises boards within one model code.
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 @esquematicosparatodos. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.