# Example

For example, you might extract a PST file that contains seven subfiles with a root node enabled. The call to `ExtractGetMainFileInfo()` returns the number of subfiles as 8 (seven subfiles and one root node). The following diagram shows the structure and the available hierarchy information after the subfiles are extracted:

Extracted PST file

The `ParentIndex` specifies the index number of a subfile's parent. The `ChildArray` specifies an array of a subfile's children. With this information, you can recreate the hierarchy shown in the following diagram.

Recreated file hierarchy

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