PDF for the 2SK2299N, 137 KB, carrying an extra _1-5 suffix in the name whose meaning is not stated; it may mark an alternate edition or page range. The 2SK prefix denotes an N-channel FET under the Japanese JIS system, so this schematic-category item is likely a datasheet. Technicians use such a file for ratings, pin order and package outline when replacing the transistor. Compare it with the other 2SK2299N copy in the index, and check the marking on the real part before substituting.
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.