The plugin.dll is needed to access some filter plugins in .8BF format. These filters may be free and can be used in other programs like Corel PaintShop or Irfanview, too. But when the filters need this plugin the users of these filters need to find a way to get it.
Therefore I ask:
Under which license is this plugin.dll and in which way is redistribution allowed?
What is the suggested way to get it legally correct?