Opening and Reading Files over 4GB

A little background:
I have noticed that the seekg() and seekp() funtions in the Standard C++ library takes an unsigned long and a parameter (maybe a long) but when dealing with really large files like this you cannot use these functions.

Two Part Question:

Does anyone know if there are any FREE libraries out there that allow a read of this size?

Is there a way to modify VC++ 6.0 library files to acomplish this?  If so, where would you start?  Would you use inheritance on something like streambuf or start at a more derived level than that?
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If you want to handle such a large file, you have to use Win32 File functions, such as CreateFile, ReadFile, SetFilePointer.

SetFilePointer is able to do it.

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You can do this using memory mapped files, and map different segments of the file into memory. These functions are very efficient, as they only load the parts you access.
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