Sounds like you need to achieve three objectives:
1. Read data in
You can read the data into QlikView using the For Each .... IN DirList(Dir) and For Each .... IN FileList(Dir) commands.
2. Organise reports
You can up a hierarchial structure using the Hierarchy command with the directory names as nodes. You would would probably only need to do this as a linked table for presentation purposes
3. Present data
You could use a pivot table, maybe with indent mode ticked in the Style properties, to show the hierarchy, collapsing it when a report has been choosen. A search box alongside that would also be useful.