Boardview file ZM2-MB-C in BRD format, 172 KB, where MB likely denotes the motherboard and C a revision, though the name gives no brand or ODM. A BRD layout shows component placement, pin numbers and net connections on both sides of the PCB. Open it in OpenBoardView, FlexBV or a similar viewer to locate parts, follow nets between components and find test points for measuring rails or tracking a short. Confirm the ZM2 marking and revision on the board before relying on positions.
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 .brd file
The most common boardview extension. Several unrelated formats share it, which is why one viewer opens a .brd and another refuses it.