BDV boardview file of about 1.05 MB for a board named NM3-E. The short name identifies no brand, model, ODM or revision, so match it against the markings on your PCB before trusting any placement. Opened in a compatible boardview viewer, it displays part outlines, pin numbers and nets, letting you click a net to highlight every connected point. That is useful when tracing a rail, locating a test pad or isolating a shorted component. Use it alongside a schematic for the same board where possible.
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 @pepeelectronica. Enginerys does not host this file.
How to open a .bdv file
Text-based boardview produced by Honhan / Hon Hai test tooling, with lightly obfuscated content.