RAR archive of 515 KB named SEM2006, an uninformative label that does not identify a device, brand or board. It may be a schematic, datasheet collection or other service document, but the name gives no reliable clue. Before using it, extract the contents with WinRAR or 7-Zip and read the title pages or file headers to learn what hardware it covers. Only rely on it for repair work once the model and board revision inside are confirmed to match the unit on the bench.
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 @generalschematics. 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.