RAR archive named Z87-A, matching an Asus Intel Z87 ATX motherboard model; the name gives no revision or indication of whether the contents are boardview, schematic or other data. Its 463 KB size suggests a layout-type repair file. Extract and check the format, then use a compatible viewer to locate components, test points and nets when tracing a short or missing rail. Ensure the revision silkscreened on the board corresponds to the file before relying on it for measurements.
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.