HModifyStructure(<Logical Name of Data File>: Character string (with or without quotes)
Name of data file (defined in the analysis) whose structure must be updated.
If this parameter is equal to "*", the automatic data modification will be applied to all the known data files (described in the analysis).
This parameter can also correspond to the name of a group of data files (or custom-folder) defined in the analysis.
for more info look at HModifyStructure in the help file.
Garry