Boardview file in BDV format, about 1.04 MB, for a mainboard labelled R63 with MB-E in the name, likely meaning motherboard revision E. Neither brand nor full board number is given, so check the silkscreen markings on your PCB before relying on it. A boardview lets you click a component to see its nets, locate pins and test points, and quickly find all parts connected to a rail showing low resistance. BDV files open in common boardview software such as OpenBoardView or FlexBV, which supports many layout formats.
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.