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Joliet

Infra & Ops På svenska → Updated: 2026-10-02
More info
Creator
Microsoft
Released
1995
Type
Filesystem extension

Microsoft's 1995 extension to ISO 9660 that gave CDs long, Unicode-encoded filenames.

ISO 9660 capped filenames at eight characters plus a three-letter extension, in uppercase — a leftover from MS-DOS. In 1995 Joliet bolted on a parallel directory tree with names up to 64 UCS-2 (Unicode) characters, without breaking older systems that only saw the short form.

The name follows a running joke at Microsoft: like Rock Ridge, it comes from a film — Joliet, Illinois, where Jake did time in The Blues Brothers. Nearly every Windows-burned CD from the late 1990s carries a Joliet tree.

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