Indexed under schematics, this 119 KB PDF for the 203DNQ080 appears to be a component datasheet for a Schottky rectifier in the DNQ range, with 080 most likely indicating an 80 V rating. No end device is named. Technicians use such sheets to read forward drop, leakage current at temperature and package drawings when hunting a replacement for a damaged rectifier. Open it in any PDF viewer, and double-check the marking on the part you removed, since similar codes can describe different packages.
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.