Boardview for a Dell Vostro board, Wistron 13040-1 with the related 13040-1M variant, plus an MIH81R tag, packed in a 3.04 MB RAR. The archive appears to cover both board numbers, so open the file that matches the code printed on your PCB. Wistron uses this numbering style for many Dell boards. A boardview viewer will show component locations, nets and pins for rail tracing, short hunting and locating test points during 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 @BoardSchematic. 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)