Generic datasheet PDF of about 147 KB whose file name gives no part number or manufacturer, only a numbered copy suffix. Its subject cannot be told from the name, so open it to identify the component before filing or relying on it. Datasheets typically contain the pinout, absolute maximum ratings, electrical characteristics, recommended application circuit and package drawing, which a technician uses to verify pin voltages, find substitutes and decode markings on a board. Rename it after checking the contents to keep the library searchable.
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 @ic_mosfet_pdf_datasheets. 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.