Only the part number 2SK2266 identifies this 412 KB PDF, which is listed as a schematic but most likely holds the datasheet for one semiconductor. In JIS/EIAJ notation the 2SK prefix covers N-channel field-effect transistors. The name gives no manufacturer, package or electrical values. The document is useful for confirming pin assignment, absolute maximum ratings and switching characteristics when a shorted or burnt FET must be replaced. Compare the body marking with the sheet before you trust any cross-reference.
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.