Originally posted by kshapero I found no file editing features.
Within the application, you have to switch to 'Laboratory' mode to do any editing.
So start in 'Browser' mode, find your files in the file browser, select an image (or set of images) to work on, then open the image, and switch from 'Browser' mode to 'Laboratory' mode to start working on it.
Despite it's poor (or just un-familiar) interface, PDCU 5 does have some useful features and some decent strengths. It's White Balance adjustment capability is very good (allowing 5 point grey point setting, for example), the complete incorporation of all the Pentax 'Custom Image' settings can also be handy too, and the 'Noise Reduction' features of PDCU 5 are actually pretty good as well.
So PDCU 5 is certainly worth getting to know better. I don't use it often, but I do keep it around.