Short PDF datasheet, 42.7 KB, for the 2SK1065 N-channel FET. The file name contains only the part number. Such sheets typically list absolute maximum ratings, electrical characteristics and the pin layout, which a technician needs when testing the transistor in or out of circuit or picking a replacement. Note that parts in the 2SK series are often marked on the body without the 2S prefix, so look for K1065 on the component. Confirm package and ratings match before installing an alternative.
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.