If on windows 11, you are unable to rename a .mp4 file to the same file name with altered capitalization. (you are, however the GUI view does not get updated)
For example, if you have a .mp4 file of a video called "youtube tutorial", you are unable to change it to "YouTube Tutorial". However if it was just simply a .txt file, you would be able to. I was initially intrigued to see if this may allow me to alter the filetype extension if I changed the filename (without it appearing in the GUI as a different file type). The file name does however appear to be changed when you try to rename it again, however you can't see it changed in the GUI.