PST Data Structure View Tool (PSTViewTool) is a tool supporting the PST file format documentation effort. It allows the user to browse the internal structures of a PST file.
PSTViewTool is a MFC/C++ app developed in Visual Studio. Other than MFC, it has no external dependencies.
PSTViewTool is largely complete with respect to its goals, and it is no longer actively being enhanced. However, patches and bug reports are welcome.
For reusable code, you should refer to the PST File Format SDK: