A 149 KB PDF for the 2N6107, catalogued as a schematic though almost certainly a datasheet, carrying an RE suffix whose meaning is not stated. A separate, smaller 2N6107 file exists in the index, so this one is probably a different edition or publisher. Datasheets for 2N-series JEDEC parts give pin assignment, outline drawing, maximum voltages, currents and gain figures. Technicians rely on them when checking a device in circuit or choosing a replacement.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)