Document app: Edit file names
If I´m changing the file´s name, I can also change the file type. This cause that users change the whole name of the file including the file type, which will cause the file to be broken. Thus it can´t be edited in Office.
Therefore it should only be possible to change the title of the document without the file type. To prevent that the file will be broken afterwards.
We are probably not implementing this in the near future. This is pretty much standard when renaming a file and people are used to it from their operating system.