Named only after the JIS transistor number 2SC3461, this 110 KB PDF is listed as a schematic but is most probably a single-part datasheet. A 2SC code indicates an NPN bipolar device in the Japanese numbering system. Repair work typically draws on such a sheet to identify leads, check absolute maximum ratings and compare gain classes when hunting for an equivalent. The file name gives no package or manufacturer details, so compare the case style and markings on the faulty component before ordering.
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.