The file name gives the part number 1SS365 and nothing more, and at 49.2 KB the PDF is the size of a typical short component data sheet. The 1SS prefix is the JIS code for small-signal silicon diodes. Technicians use the sheet to identify the cathode side, check voltage and current limits, and compare candidates when cross-referencing a damaged diode. It opens in any standard PDF reader. Before relying on it, confirm the marking and package on the board belong to this part.
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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.