Named after part 2SK2218, this 213 KB PDF appears in the schematics section but is most likely the datasheet for an N-channel FET. The 2SK prefix follows the Japanese JIS/EIAJ convention for that device class. Nothing further about manufacturer or case is in the name. Technicians open sheets like this to check terminal order, drain-source breakdown voltage, continuous current and on-resistance. These are the key parameters when sourcing a replacement for a failed power or switching transistor.
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.