Is Finder meaningfully different from the Windows Explorer, the BeOS Tracker, GNOME's Nautilus or KDE's Dolphin, or is it actually clear from context that every desktop OS has something like this that does the same work?
Right - they are referencing Finder which makes me think of the Mac OS. But then showing all the other services on their site makes me think this is something closer to what was Greplin (now CueUp).
If file manager, then they may have a Windows version too. If not, this becomes a Mac-focused article.
Terminology matters.