Documentation package for the ECS H81H3-AM motherboard at revision 1.0, stored in a 1.01 MB RAR file. The board name indicates the Intel H81 chipset; what exactly is enclosed is not stated, though a schematic is the common content. It can be used to follow power from the ATX connector through the VRM, find standby rails and the PCH supplies, and locate parts when a board shows a short. Unpack with a standard archiver and check the revision printed on the PCB, as later revisions may change 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 @IT_SERVICE_WORLD. 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.