From OSDev Wiki
Joliet is an extension to the ISO 9660 filesystem and was created by Microsoft in 1995. It allows longer filenames of up to 64 characters in 16-bit character set UCS-2, and relaxes some of the restrictions associated with full ISO 9660 compliance.
- ISO 9660, about the hosting fileystem.
- ISO 9660#Rock_Ridge_and_Joliet, the section about extensions to ISO 9660.