I just saw it. Although it doesn't do what I need here. I want to retrieve from a file name (not a path), both the file name without the extension and the extension. So I still need that function, but will need to rename it.

By checking #4379, it looks like `getFilenameExtension` does the same as `_getFileExtension`. Also a FileEntry has the file base name stored on it. So not sure why `getBaseName` is required. I could make a new issue for this 2 things.