Really, in most software, "save" and "export" functionality has been merged. Because "whether or not the format is the preferred format of the program" isn't even an implementation detail. It's a developer preference. It has absolutely no place in the main tool. Having one list of formats for "save" and a different list of formats for "export" is beyond insane. Worse than old-Photoshop's "you can't save in this format, because you are using features X, Y, and Z" (instead of just launching a conversion process) - Gimp doesn't give you the option *whether or not* you're using incompatible features.