Archive for the Samsung Galaxy Tab 4, model SM-T530, about 1.54 MB in zip format. The name does not say what is inside; most likely it holds service documents such as a schematic or layout, but extract it to confirm. Material of this kind helps trace power, charging and display faults on the tablet's main board. Make sure the model on the rear label is SM-T530 exactly, since LTE and other Tab 4 variants use different boards, before relying on the contents.
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.
Built-in OS tools7-Zip