As far as your computer is concerned, there’s no difference between a folder named “my stuff” or “My Stuff,” so Windows may not always accept uppercase or lowercase changes to files or folders. Microsoft calls this “prettying the path,” and it takes just a few steps to get around this for an individual file or folder. You can also prevent Windows from ignoring capitalization changes by editing your Registry, but this is recommended only for very advanced users, with prior experience editing a registry.
Instructions
Single-Item Fixes
1. Right-click on the file or folder you want