At 208 KB, this PDF named 1N6266 is the largest in the group and is a datasheet for a JEDEC 1N-numbered component, catalogued under schematics. The filename gives only the part number, so the device type, ratings and curves should be read from the document. Larger datasheets of this kind often include extra characteristic graphs and detailed mechanical drawings. Use it to confirm pin identification and polarity, check limits and find an equivalent part, verifying the package and lead orientation against the original.
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.