How to determine physical drive mapping?

Hi,
after selecting a file using the FileChooser dialog, i would like to convert the file path like "H:\index.htm" into a form like "\\filer01\dir\index.htm", where \\filer01\dir corresponds to the physical drive mapping.
On my system, the logical device name H:\ is mapped to a directory on a file server "filer01".
Is there any possibility to do this conversion by getting the physical drive mapping from the systems environment?
Thanks in advance.

I've got a book called Visual Basic Programmer's Guide to the Win32 API, by Dan Appleman, where I look up things like that. But it's all available online on MSDN.

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