The 2SK1473 is the only information the file name gives, and that code follows the Japanese JIS scheme where 2SK means an N-channel FET. This 124 KB PDF is catalogued as a schematic but should hold the part datasheet: ratings, characteristics, pin assignment and mechanical drawing. It helps when measuring a MOSFET for a drain-source short, verifying gate drive levels or selecting an equivalent. Any PDF viewer opens it; check the device marking on the board before ordering or fitting a replacement.
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.