What's the best solution for making a "virtual folder list"

[rsilva]

I'm making now an application that the user can save their maps and create folders and arrange it like they want.

I'm using the normal directories with a "mapdir.xml" that contains that it's a valid map virtual folder and the number of valid maps and subdirectories. So, everything that the user do with the application to move, rename, delete or add, I'll create, delete, rename or move a directory or file. The maps has two files, "mapname.map" and "mapname.xml".

edit: The user is viewing the "valid" directories and files in a QTreeWidget, is there a better way to show these items ?

edit (again): I've just noticed while moving "big" directories makes there's a delay to update the items.

Is there a better way for doing this instead of using normal directories with "map format" ?

I've thinking about using SQL but I never used it, I can do it with this ?
Is there another good solution ?