/sys$common/syshlp/helplib.hlb ANALYZE, /RMS_FILE, Qualifiers, /FDL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Generates an FDL file describing the RMS data file being
    analyzed. By default, the /FDL qualifier creates a file with the
    file type .FDL and the same file name as the input data file. To
    assign a different type or name to the FDL file, use the /OUTPUT
    qualifier. If the data file is corrupted, the FDL file contains
    the Analyze/RMS_File utility error messages.

    For indexed files, the FDL file contains special analysis
    sections you can use with the EDIT/FDL Optimize script to make
    better design decisions when you reorganize the file.

    You cannot use wildcards or multiple file specifications with
    the /FDL qualifier. The /FDL qualifier is not compatible with the
    /CHECK qualifier, the /INTERACTIVE qualifier, the /STATISTICS
    qualifier, the /SUMMARY qualifier, or the /UPDATE_HEADER
    qualifier.