Datasheet-style PDF of 31.0 KB for the 2SJ595, catalogued among schematics. JIS designations starting with 2SJ belong to P-channel field-effect transistors. A repair technician typically opens a file like this in a PDF reader to look up the pinout, absolute maximum ratings, on-resistance and outline drawing when a switching transistor is suspected of failing. The name carries no manufacturer or package information, so match the body marking on the part before using the data for a replacement.
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.