When naming input files or folders, do not use any of the following characters.

• Do not use the + - \ / | < > [ ] { } ? . , ! @ # $ % ^ & * ( ) = : ; ' " characters in file names.
• Do not use spaces, including trailing spaces, in your file names.
• Use a period (.) only when using file name extensions—for example, readme.txt.
• Do not use file names longer than 32 characters.