disabling autogen scenery

Hi,I have discovered that some of the default texture tile sets have autogen objects associated with them but without there being any corresponding agn files in the WorldTexture directory. Specifically, texture set 025b has autogen trees scattered randomly but without there being any agn file. If one keeps the original default MS textures this doesn't really matter too much but but if one changes the textures for more realistic ones the randomly scattered auotogen trees make the scenery quite ugly since they don't line up with any of the terrain features. I wonder if anyone knows how to disable this autogen scenery. I know it's possible to do so using an exclude file but that only covers a very specific area and what I want to be able to do is to disable the autogen scenery for those textures wherever they appear.Thanks in advance,APM