Lenovo boardview in TVW format for the NM-B021 motherboard, revision R03, with DL470 as the board project prefix, in a 3.50 MB zip. NM-xxxx numbers are used by LCFC, the Lenovo-owned ODM, and the same pattern also appears on older Compal-built Lenovo boards. The .tvw file opens in Teboview or other viewers that support the Tebo format, letting you locate parts, follow nets and find test points. Check that the board reads NM-B021 and revision 03 before relying on placements.
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 @SCHEMATICWORLD. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.