The only detail in this 92.7 KB PDF name is the part number 10MQ060N, a middle grade between the 10MQ040N and 10MQ100N files listed alongside it. Numbering follows International Rectifier style, so the content is likely a datasheet with ratings tables, curves and package dimensions. A technician uses it to check that a replacement meets the original voltage and current limits and to confirm the cathode marking before soldering in a new part.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)