Short PDF, 43.6 KB, named after the 2SK2791 and listed as a schematic. The 2SK prefix marks an N-channel FET under the JIS scheme, so this is likely a compact datasheet. It can confirm pinout and principal ratings such as drain-source voltage and drain current, which is what matters most when testing or replacing the part. The small size suggests limited graphs or detail. Match the printed code and package on the board, and look for a fuller sheet if deeper parameters are needed.
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.