No, the plugin is really kewl but it can't open all PVR files. The best ways to convert the pvr files into another are these:
-Try to open as many pics as possible with the Plugin using Photoshop
-And for the other files which ya can't open, simply use pvr2bmp or pvr2png .
-Open the new .xxx files with a graphic program of your choice and to save them, use the PVR plugin (maybe you've change file attributs like compression mipmapping, texture type, etc. if you've convert the pics to bmp/png using one of the toolz I mentioned before).
I had a lill' probs using some of the .PVR files but this method works best for me.