RAR archive, 225 KB, for the H81T, a compact Intel H81 chipset board; the name gives no revision or content details. Given its size it most likely contains a boardview or schematic, but extract it first to confirm what is inside. Documentation of this kind helps a technician locate components on a dense small-form-factor layout, trace power rails and signals, and find test points when diagnosing a no-power or no-boot fault. Check that the revision printed on the PCB matches the file before probing.
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.