This is the new and improved XNView plugin.
Updated to V 0.7 to fix a bug when saving the files files in a format other than png
This python script will call an external program, providing the active layer or a new from visible layer to this external program via a temp file. Once the external program is completed, it should save/overwrite the orignal temp file which gets pulled back in to gimp.
This was initially developed to use photoshop plugins under XNView since pspi support is more or less broken in the latest versions of gimp.