As to show comparison from other application. In Chrome for instance we can set it to all under file-types. This will allow the use to show all files. Down side is that i think user needs to add an extension. Thats not difficult though.
Notice how now when i save i can view all files in a folder. This us way more convenient!
Chrome has all in file types which is more conveneint when saving files
Here is also a link to Windows developer page i believe. Its show thats it is possible, like Chrome already showed
They state its convenient for a user that file types are filtered. I dont find that actually convenient, it slow my workflow down. I dont always use the same types and want to know what is in a folder.