Small 140 KB PDF whose name is simply the number 75005382, carrying no hint of manufacturer, device or component type. It is filed under schematics, but the numeric title reads like a document or catalogue number, so open it to find out whether it is a datasheet or a partial circuit drawing. Whatever it contains, check that the part numbers, package and markings shown match the component or board in front of you before trusting the pin assignments or values given.
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.