Reference sheet in PDF form for the 2SK2349, sized 54.7 KB and listed in the schematic category. Parts beginning with 2SK follow the Japanese JIS registration for N-channel field-effect transistors, so this is almost certainly a datasheet. A repair technician would consult it for drain-source voltage, continuous drain current, gate threshold and pin assignment when testing or replacing the device. Any PDF viewer opens it; check the package type matches the board footprint before ordering a substitute.
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.