Tiny 14.4 KB PDF titled 25C020, filed under schematics with no brand, board or device named. The code fits the 25-series SPI EEPROM naming, where 020 usually stands for 2 Kbit. Given the small size, the file may be an abbreviated sheet rather than a complete datasheet, so it is worth opening before relying on it. Such information helps a technician wire the chip correctly to a programmer and choose the right device profile. Always save the original data before attempting a write.
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.