Second copy of a Quanta LV6 archive, matching the other LV6 package at 5.46 MB, so it is likely a duplicate. No revision, board number or document type appears in the name, so unpack it to see whether it holds schematics, boardview data or both. PDF schematics open in any reader, while boardview files need a viewer such as OpenBoardView or FlexBV. Always confirm the revision printed on the motherboard matches before using the documents for diagnosis.
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 @cyberlanelectonik. 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.
7-ZipWinRARThe Unarchiver (macOS)