I have read here:
that diropus can access NFS network shares.

How can I do that?

I think the Wikipedia article is inaccurate. Opus should probably have "Partial" instead of "Yes", with the same note as for Total Commander etc.:

"NFS support in these file managers require the installation of Services for UNIX."

SfU lets you mount NFS directories on a Windows machine so they can be used by all applications. You can download it from Microsoft, unless you're running XP Home or Win9x.