Flash memory datasheet PDF of 522 KB named 29DL16X, listed as a schematic. The name indicates a 29DL16x family part, a 16 Mbit dual-operation parallel flash series, with the x standing for variants; no brand of device or board is stated. Expect bank organisation, boot sector options, pinout and command definitions. Repairers use such sheets to identify the exact variant and configure a programmer correctly. Compare the full marking on the chip with the variants listed, and back up the contents first.
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.