ZIP archive of 3.80 MB for the DJ5 motherboard, Wistron board number 10321-1, also tagged 4ND01. MB marks the main board, and the five-digit number with dash revision is typical of Wistron designs. The 4ND01 token is likely an extra project or part reference. The contents are probably a schematic and are useful for tracing power rails, checking signals and locating faulty components. Compare the PCB silkscreen with 10321-1 before trusting the material.
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 @ITHINKHS. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.