ZIP archive of 1.21 MB for the MSI MS-7623 motherboard, labelled BVD, which most likely stands for boardview data, though the exact contents should be confirmed after extraction. A boardview lets a repair technician see component placement on both sides of the PCB, look up which net a pin belongs to and locate test points for probing rails. Typical viewers include OpenBoardView and FlexBV depending on the inner format. The MS-number is MSI's own board code; no revision is stated, so verify against the silkscreen.
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 .zip file
Compressed archive that every operating system opens without extra software.