Datasheet in PDF form for the 1N4936GP, a glass passivated version of the 1N4936 fast recovery rectifier, about 45.7 KB. GP normally stands for glass passivated junction in diode part numbers from vendors such as Vishay. The document lists reverse voltage, forward current, surge capability and recovery time, which a technician checks when choosing a replacement for an inverter, snubber or SMPS output diode. Any PDF viewer will display it, and the body marking and polarity band should be matched against the drawing inside.
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.