A PDF for the 2SC5464FT, 125 KB, indexed as a schematic. The FT suffix appears to denote a specific package or variant of the 2SC5464 NPN transistor, but the name does not explain it, so check the sheet itself. The contents are most likely datasheet material: pinout, outline drawing, limits and characteristic curves. Compare it against the plain 2SC5464 file to see which variant is fitted on the board, because a different package changes the footprint and can change the pin order.
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.