An 85 KB PDF named 10BQ100, catalogued as a schematic but following the part numbering of a surface-mount Schottky diode family in the International Rectifier and Vishay style. The content should be a short datasheet with voltage and current ratings, forward characteristics and the SMB-type footprint. Technicians use it to identify a failed small rectifier on a board and to choose an equivalent with at least the same reverse voltage. Check the package marking code against the sheet, since tiny parts often carry abbreviated codes.
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.