PDF datasheet of 287 KB for the 2SK2009, an N-channel field-effect transistor under the Japanese 2SK designation. It appears in the index as a schematic but covers a single part. Open it in a standard PDF viewer for pinout diagrams, package dimensions, ratings tables and characteristic curves used when diagnosing a failed FET or sourcing a replacement. The name gives no manufacturer, package or revision, so check that the marking on your transistor matches before using the figures for substitution.
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.