Reminds me of PSD and this comment:

    // At this point, I'd like to take a moment to speak to you about the Adobe PSD format.
    // PSD is not a good format. PSD is not even a bad format. Calling it such would be an
    // insult to other bad formats, such as PCX or JPEG. No, PSD is an abysmal format. Having
    <snip... many more lines>
    //
    // PSD is not my favourite file format.

from https://github.com/kjk/xee/blob/master/XeePhotoshopLoader.m

(I have many GB of scanned photos in this format from a canon scanner)