Archive with very little identifying information: the name gives only L78 and states test ok, meaning the contents were reportedly tested and working. No brand, board number or file type is stated, so the 6.08 MB package could hold a firmware dump or other repair data. Extract it and inspect the contents before use. If it is a BIOS image, back up the original chip with a programmer before writing and check the image size matches the flash capacity, since a mismatched dump will not fit.
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 @SCHEMATICWORLD. 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.