I have ffdshow rev 1685 2007-12-06.
It came packaged with ZoomPlayer.
I opened a folder with movies in explorer and ffdshow put up a dialog, saying that explorer.exe is neither in the black or white list and asking what to do.
I find that surprising, as explorer.exe is a program present on all installations of Windows, so it must the the most frequent user of ffdshow.
Is there a special reason for not including it in either list ?