How could I use CHString?

I found CHString in MSDN. MSDN indicate that CHString Declared in Chstring.h and Use Framedyn.lib
but i could not found them in platform SDK and my Visual-C so i can't use it.
where could i found this files?
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MRNMurthyConnect With a Mentor Commented:

Try installing all the components of the Platform SDK.


MRN Murthy
Your platform SDK is out of date.  

Download the latest from and update your system.
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