Filed under schematics, this PDF of 309 KB is named only after the 24C64 part number, so it is most likely the datasheet for a 64 Kbit (8 KB) serial EEPROM on the I2C bus. Technicians consult such a document for pinout, device address pins A0-A2, write-protect behaviour and supply range before reading or rewriting the chip. 24C64 parts commonly hold configuration data in monitors, TVs and laptop peripherals. Check the exact marking and manufacturer on the package, since timing and package details vary between vendors.
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.