VMS Help CMS, DELETE, GENERATION, Qualifiers, /ARCHIVE=[file-specification]  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies a file to which CMS writes archived generation
    information. If the file specification is omitted, CMS creates
    a file for each with the same name as the element and the .CMS_
    ARCHIVE file type and places it in your default directory.