VMS Help  —  Ext File Specs, Using  Command File Specification, Case Preservation and $FILE
    DCL attempts to preserve the casing of file specifications. It
    can do this only for commands defined with the Command Definition
    Utility (CDU). DCL preserves case for any item defined in the
    command definition file (.CLD) with the $FILE parse type.

    Refer to the Command Definition Utility manual for more
    information.
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