Some forum members have engaged in the irritating practice of renaming bitmaps which have no need for losslessness to jpegs, or the almost as irritating practice of zipping that kind of bitmaps. I realize not everyone have basic experience in handling images, or maybe they're young and haven't learnt it yet, but COME ON! That's just so friggin lame and hogs space and severely increase download times needlessly.
Well, I fixed it now. All those cases are now normal jpegs. So if someone zipped an image it's not found in the archive list but here in the image list / gallery.