I ask this because at first, this was little confusing to me. Where the hell is box lower right, I ask myself. I thought that this apply to ddsopt gui itself insted of browse box. Silly i know. During the extraction i did choose (*.bsa) files and they remain. No problem about that. But, during optimization, every time i click on browse (upper ddsopt box) for searching folder to optimize(e.g. Vanilla Body Textures), it shows DirectDraw Surface (*.dds) and i need manually put "All Documents (*).(*)" So when i want to optimize Vanilla Exterior Normal Maps, again shows .dds. ddsop is run by admin privilege and i use x64 version.