Datasheet in PDF form for the 2SK3565, an N-channel field-effect transistor by its 2SK prefix under the Japanese JEDEC-style numbering. Expect maximum ratings, on-resistance, capacitance figures, safe operating area and the package outline. Repair technicians open it with any PDF reader to confirm pin order and electrical limits when replacing a blown switching device in switch-mode supplies, and to pick an equivalent with equal or higher voltage and current capability when the original part is unavailable.
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.