Archive whose name points to service manual material for the Samsung Galaxy S3 variant i535, the Verizon version of the phone. At 4.45 MB the RAR likely contains PDF documentation such as block diagrams, board layouts, disassembly steps and troubleshooting flowcharts. Phone technicians rely on such manuals to locate components, trace charging, display and audio circuits, and follow fault-finding procedures. Confirm that your handset is the i535 model, because international S3 variants use different board layouts and part placements.
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 @Schematic_mobile_iran. 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.