PCX Plugin for Paint.NET
I've started using a free image editing application called Paint .NET. It's good stuff. Not quite ready for professional work, and I still miss some features from PhotoShop, but you can't meet the price and the UI wasn't designed by idiots (like most free software).
It was missing PCX file support so I added it.
Forum post here: http://paintdotnet.12.forumer.com/viewtopic.php?p=15973
PCX plugin download here: http://www.calormen.com/tmp/PcxFileType.zip