Upper and Lowercase in Your Folder Name

When you type a new name for a folder or a file in the Explorer, by default Windows will capitalizes the first letter and makes all the rest of the letters lowercase. Even if you try to type all of the letters in uppercase, you only get one uppercase letter. However, if you type only lowercase letters, the first letter isn't capitalized. If you type more than eight characters in uppercase or mixed case, they will keep their individual cases.

If you include characters that are not allowed in the DOS format for file or folder names (e.g. a comma), the case of the individual letters is kept. Typing long file or folder names (over eight characters) keeps the name as you typed it.