Compact 57.1 KB ZIP archive named BoardView2, likely an early version of a boardview viewer; the name carries no brand, board or version details beyond the number 2. Such small viewers open laptop board layout files and show component outlines, pin connections and net names to help locate test points and trace faults. Older tools may support only a few formats and may need compatibility mode on current Windows. Check the contents and scan any executable before running it.
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 @boardview_software_download. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.