The 128 KB PDF named 93LCX6 matches the naming of 93LC-series Microwire serial EEPROMs, so despite the schematic label it is likely a datasheet covering several densities in that family. It would describe pinout, organisation options, timing and the read and write command set. Repair technicians use such data to read or rewrite small configuration EEPROMs with a programmer. Always save the original contents first, and check the exact part marking and supply voltage before programming.
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.