A 28.6 KB PDF named after the 2SA1179, a PNP transistor under the JIS 2SA designation. With only a part number in the name, it is almost certainly a brief datasheet rather than a circuit schematic. Technicians consult such sheets for pinout, package style and absolute maximum ratings when testing or replacing a transistor. They also use the hFE rank tables to match gain. Its small size suggests a short document, so verify any critical parameter against a second source before choosing an alternative part.
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.