Thanks for the reply, but that program isn't working either. I downloaded it off of the internet, and when I go to double click the pdn2png.exe file, a small black box pops up and then pops right back off of my screen. No program has been installed. I'm not sure how old this plugin is, but I am guessing that it is not compatible with my newer computer operating system.
Why would Paint.net all of a sudden stop working for me after YEARS?! This is beyond frustrating and I have made no recent changes or updates to my computer. It just up and stopped working. It makes absolutely no sense to me.