A 67.7 KB PDF reference for the 1SS395, recorded as a schematic in the index. The 1SS prefix is the Japanese JIS-style designation for small-signal diodes, so the content is probably the part datasheet. The filename gives only the number and an underscore, with no device or board information. Board repairers use such sheets to check forward voltage, reverse limits and package dimensions, and to match SMD marking codes. Compare the package and pin arrangement against the board footprint before substituting another diode.
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.