A 108 KB PDF titled 2SC4110, catalogued under schematics although the name is simply a semiconductor part number. Under JIS/JEITA naming, 2SC denotes an NPN transistor aimed at high-frequency duty, so the file is probably the manufacturer datasheet for that device. Use it to check collector-emitter voltage, collector current, power dissipation and the pinout of the package before soldering a replacement. Package variants can differ in lead order, so verify the outline drawing against the part on the PCB.
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.