Compact RAR named for the Z87M-PLUS, a micro-ATX motherboard designation from the Asus Intel Z87 lineup; the name gives no revision or content type. Around 600 KB suggests a boardview or schematic-style service document rather than a firmware image. Once extracted, a boardview opens in viewers such as OpenBoardView or FlexBV for locating parts, test points and nets. Confirm the revision silkscreened on the PCB matches the file before using it to trace power rails or check 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 @boardview. 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.