Joliet is an extension of the ISO 9660 standard, developed by Microsoft to allow CDs to be recorded using long filenames, and using the Unicode international character set. Joliet allows you to use filenames up to 64 characters in length, including spaces. Joliet also records the associated DOS-standard name for each file so that the disk may be read on DOS systems or earlier versions of Windows. The number of characters allowed in a long file name is up to 64, and the number of characters in the long file name plus its file path cannot exceed 128..