A 396 KB PDF for the 2SK2274, listed under schematics but most likely a datasheet, since 2SK denotes an N-channel FET in the JIS numbering scheme. The size suggests full characteristic curves and package drawings alongside the ratings tables. Use it to check drain-source voltage, current capability, on-resistance and gate threshold when evaluating a failed switching transistor or choosing an equivalent. No variant appears in the name, so compare the marking and case on the actual component 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.