fireman_stubbs

i am using paint.net to create custom cars that i can race online for the game NASCAR 09.when i save my file it says that it has to be saved as a .dds file.when i save it as the .dds file and try to upload the files to the website it tells me that i cant generate mip maps.can anyone tell me what i can do to not generate these "mip maps" when i make these cars?any help would be great