Datasheet-style PDF, 110 KB, carrying the part number 27l2048 and placed in the schematic category. The naming matches the 27-series EPROM line, where an L often marks a low-voltage device. No device, manufacturer or board is stated. A technician would open it in any PDF reader to look up pin assignments, power requirements and programming parameters. That is needed to pick the correct profile in a universal programmer and avoid damaging the chip with wrong voltages. Confirm the exact suffix on the IC.
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.