Repair material for the Sony Xperia Z5 Premium in a 6.69 MB RAR archive; the name states only the model, not what documents are included. Expect schematics, layout pictures or a service guide, the usual contents of such bundles. With these a technician can follow the power-on sequence, find test points around the PMIC and charger, and trace display or camera connector lines. Open the archive first to confirm its contents and check that the board revision on the PCB agrees with the documents.
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.