Exceptions that are thrown from an application that runs in a 64-bit version of Windows are ignored
Consider the following scenario:
* You run an application on a 64-bit version of Windows Server 2008, Windows Vista, Windows Server 2008 R2, or Windows 7.
* An exception that is thrown in a callback routine runs in the user mode.
In this scenario, this exception does not cause the application to crash. Instead, the application enters into an inconsistent state. Then, the application throws a different exception and crashes.
A user mode callback function is typically an application-defined function that is called by a kernel mode component. Examples of user mode callback functions are Windows procedures and hook procedures. These functions are called by Windows to process Windows messages or to process Windows hook events.
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