Small 1.49 MB ZIP archive for the Apple iPhone 6 Plus, with only the model named. It most likely holds a schematic or boardview file, but check the contents to be sure. Such files help a technician locate components, follow rails out of the power management chip and check suspect lines for shorts or open circuits. Boardview files open in viewers such as OpenBoardView or FlexBV. Because the 6 Plus board differs from the iPhone 6, check the device and board markings before relying on any reference value.
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.