Small PDF of about 74 KB named 8EQ045, filed under schematics. The name looks like a power diode part number, likely a Schottky-type rectifier in International Rectifier style coding, so the content should be a datasheet rather than a board drawing. Use it to read maximum ratings, forward drop, package outline and polarity when a rectifier on a supply output or input protection fails. Because the name carries no other detail, confirm the marking on the physical part against the document before relying on it.
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.