At 377 KB this is the largest of a group of PDFs named after 1N part codes; this one is 1N1183, a JEDEC style diode designation, so it is most probably a datasheet even though it is classed as a schematic. The name states no manufacturer or package. Such files are handy for confirming voltage and current ratings, thermal limits and outline drawings of power rectifiers during repair. Read it in any PDF program, and verify the marking on the component itself before trusting the figures for a swap.
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.