even if a further version were developed it would be stupid to listen to every single suggestion for filetypes
might as well have an alphabetic list of every single 1 2 3 or 4 letter combination possible then it would make it extremely easy to search for a specific file type... by going through the list
the common ones people actually use are on the list, and then any other files a few people might want are covered by the any file type search and typing the extension you want - cluttering up the list so that the majority of searches for the common file types you have to spend ages hunting on the huge list doesn't benefit anyone, as those wanting common filetypes would only have a bigger list to search through giving them no benefit, and those going for uncommon filetypes it would still be much faster to type than to go through a huge list of every possible file extension