2004.10.01 07:22 "[Tiff] BigTIFF extension issue", by Joris Van Damme

2004.10.03 00:39 "Re: [Tiff] Re: BigTIFF extension issue", by Chris Cox

Companies/products/people just don't do that. They put a version number inside the file that distinguishes it. And that surely is what we are doing (or should be doing) for BigTIFF, even if it's indirectly so. It's still TIFF.

No, they DO (have done, will keep doing) that. When the change is big enough, you sometimes have to give it a new name.