FlexBV free edition, version 5.3162, for 64-bit Windows, in a 14.5 MB ZIP. FlexBV is widely used to open boardview formats including BRD, BDV, BV, TVW, CAD and FZ, offering net highlighting, part search and dual-side views. The free build has limits compared with the paid licence, but it covers most daily repair lookup of components and test points. Check that the boardview format you need is supported by this version, as newer formats sometimes need later releases.
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 @schematiclaptopramkushwaha. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip