DirName returns a FAT 16 compatible string based on the provided named directory.

Rename returns a FAT 16 compatible string based on the provided filename.

Truncate returns the filename in a MS-DOS 8.3 friendly format, truncating the name if necessary.

BaseLen is the maximum length of a filename without the extension on a FAT 12/16 file system.

ExtensionLen is the maximum length of a filename extension on a FAT 12/16 file system including the dot.