The file name gives nothing beyond 2SK2233, a JIS/EIAJ designation whose 2SK prefix marks an N-channel field-effect transistor. The 401 KB PDF sits under schematics, yet a part-number name like this normally means a component datasheet. Manufacturer, package and ratings must be read from the document itself. Technicians consult such data to verify pinout, breakdown voltage, drain current and gate charge, and to judge whether a proposed equivalent is safe to use in a power or switching stage.
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.