The file, a 106 KB PDF placed in the schematic category, is identified only as 2SJ265. That number follows the JIS scheme for P-channel field-effect transistors, so it is most likely a datasheet describing a single discrete device. Repair technicians rely on such documents to check maximum ratings, threshold voltage and package drawings when a suspect transistor reads shorted or fails to switch. It opens in any standard PDF viewer. Check polarity, package and pinout of any proposed substitute against the original.
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.