Brief 28.4 KB PDF for the 2SK2864, indexed as a schematic; its small size points to a one or two page datasheet or summary. The name gives only the part number. According to JEITA naming, 2SK marks an N-channel FET. The document is useful for quick checks of pinout and main ratings when testing or substituting the transistor. A short sheet may lack characteristic curves or detailed package dimensions, so verify the data you need is included and compare with the marking on the device.
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.