RAR archive of 3.76 MB whose name lists only JW8, JW8B and JW8C, apparently variants of one project or board code. No brand, board number or contents are given, so the material is hard to identify from the name alone. Extract it and inspect the files for a schematic, boardview or firmware, then compare any board number inside with the marking printed on your PCB before using it for rail tracing, component location or reflashing.
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 @ShareMan_Electronic_Files. 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)