The 2SK2445 gives its name to this 410 KB PDF, categorised as a schematic yet most likely a datasheet, because 2SK codes in the JIS scheme identify N-channel FETs. Nothing else, such as manufacturer, case style or voltage class, is stated in the name. Open it in any PDF viewer to check the pinout, maximum drain-source voltage, current capability and switching characteristics, which are the key parameters when searching for an equivalent part to replace a failed transistor.
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.