Copy-numbered RAR archive for the OPPO R7s, 1.29 MB, matching the size of the other R7s package and therefore probably a duplicate. Compare the two before deleting either. Inside you can expect schematic or layout pages used to trace power rails from the PMIC, check USB and charging lines and find the components and test points involved in a short or no-boot fault. Check that the device is the R7s and not the R7 or R7 Plus, since those use different boards.
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 @cyberlanelectonik. 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.
7-ZipWinRARThe Unarchiver (macOS)