Zip archive for the Samsung SM-T111, the Galaxy Tab 3 Lite 7.0 model code, with no indication of the contents. At 1.74 MB it is far too small for full stock firmware, so it more likely holds a schematic, layout or service document. Extract it to see what is included. For tablet repair such files help trace power, charging and display circuits and locate test points. Check that your unit's model code and board revision match before relying on the material.
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 @Schematics_Mobile. 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