Boardview for a motherboard identified as R23-MB-D, packed in a 128 KB RAR archive and supplied in BRD format according to the name. The suffix D most likely marks the board revision, but the laptop model and brand are not stated. BRD files open in viewers such as OpenBoardView, FlexBV or BoardViewer, letting you search a part reference, highlight a net and locate test points while probing a dead board. Confirm the code printed on the PCB matches R23-MB-D before trusting pin locations or component placement.
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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.