Compact 33.4 KB PDF for the 2SK1374, a Japanese-numbered N-channel MOSFET. Only the part number appears in the file name, so the issuing manufacturer and exact package are not stated and should be confirmed from the component itself. Short sheets of this size typically hold the key table of absolute maximum ratings, electrical characteristics and a pinout diagram, which is enough to identify gate, drain and source and to select a suitable replacement when a switching transistor has failed.
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.