The purpose of the "NM" System Use Field is to store the content of an Alternate Name to support POSIX-style or other names. ... If no "NM" field(s) are recorded for a specific directory record, the ISO 9660 file identifier shall be used. If more than one "NM" System Use Field appears in (all) the System Use Area(s) for a single directory record, the contents ([5] below) of each should be concatenated together, in the order in which they were recorded, until a CONTINUE flag with value zero is encountered (see [4] below), to obtain the entire Alternate Name.

The Sun386i VP/ix MS-DOS emulator subsystem contained a utility which created DOS compatible short filenames with Unix long filename support. Available under SunOS releases 4.0, 4.0.1 and 4.0.2

This is the final judgement of the German Bundespatentgericht on this patent. It was completely demolished.

User guide for UMSDOS

Article describing how the patent was overturned in Germany in 2007.

Microsoft document that was published at least 4 months before the first patent application, however this was considered by the examiner in the reexamination.

Paper that identified the problem of different operating systems having different filename limitations. Proposed a mapping solution for this problem.

Article that anticipates long filenames, having multiple directory entries for a single file, and having directory access routines to provide a consistent interface to both old and new file systems.