RAR archive of 1.05 MB whose name consists only of the number 1458, so it reveals nothing about the device, board number or contents. The number looks like a collection index rather than a model or board code. Open it with WinRAR or 7-Zip and inspect what is inside, whether a schematic PDF, a boardview or a firmware image, before using it. Then compare any board number found in the documents with the one silkscreened on the PCB, because a mismatched revision can send rail tracing and component checks in the wrong direction.
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.