EFI$HELP.HLB  —  FAT Filenames
    FAT filenames referenced within EFI$CP always use a device or
    device alias name, and use backslashes as directory and filename
    delimiters.

    When referencing a directory, a trailing backslash is expected
    and must be present. If no trailing backslash is present,
    the trailing portion of the specification located after the
    final backslash is assumed to be a filename. The exception is
    CREATE/DIR which will assume a trailing backslash if not present.

    Both FAT short and long filenames are permitted, as are filenames
    containing various special characters as defined in the FAT
    specifications. FAT is case-preserving and case-blind.

    ddcu:\dir\subdir\file
    ddcu:\dir\subdir\file.ext
    ddcu:\dir\subdir\subdir2\
    "ddcu:\long name with spaces\"

1  –  Description

    Example filenames are available in the example. The first two
    example specifications reference FAT filenames, while the third
    example shown references a directory. The final shows use of
    double quotes, which are needed when the specification contains
    characters such as spaces, to specify a particular directory.

    Relative directory specifications and multiple FAT device mounts
    are not presently available; all FAT specifications are absolute,
    and only one FAT device can be mounted within EFI$CP at any one
    time. No wildcards are presently available.
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