Has anyone been able to set this up successfully?

Image sequence field="C:\Program Files\Pdplayer 64\pdplayer64.exe"
optional flags = "%f --fcheck --range=%s-%e/%b --fps=%r"

PDplayer will open but will not show or play any frames.
The error I get is
// Warning: line 0: Command format is not specified for Image Viewer in preferences.

Does anyone have an idea on how to set this up correctly?

Thanks for any help
S