Catalogued as a schematic, this 67.7 KB PDF is named after the 1SS193 part, followed by an underscore that adds no detail. In Toshiba's JIS-style numbering, the 1SS prefix marks small-signal switching diodes, so the file is most likely a device data sheet. Technicians use it to read forward voltage, reverse recovery and maximum ratings, and to match the package marking and internal pin configuration on the PCB. That check matters before fitting a replacement. Any PDF reader opens it.
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.