No File in Use Message while uninstalling Software in Windows 7

I started MS Word and keeping it open, when i try to uninstall it in Win 7, it does NOT give message "File in Use" and uninstall MS Word.
Here the main concern is Why the "File in Use" message is not displayed before uninstalling the software????
This behaviour happens when you uninstall any software in Windows 7.

Any information about it is always welcome....

Thanks in Advance!!!


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