After beta testing DxO Optics Pro v3, I have purchased the product with the knowledge that there are some very inconvenient limitations.
The biggest limitation is that it does not provide a thumbnail view of files that you want to add to the processing batch.
A very nice solution has presented itself.
Microsoft has just released a "Powertoy" for Windows XP for showing thumbnails for raw photos in the Explorer.
With this powertoy installed, you can see the thumbnails as you browser around your system normally.
Then you just drag-and-drop the photos you want to work on into DxO Optics Pro.
The powertoy is to be found here:Microsoft WinXP Raw Photo Powertoy