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As described in the help file (under System Macros):
<snip>
Visual Build Professional provides the following predefined system macros and tools. Windows also defines some of these macros as environment variables, which will take precedence over Visual Build Pro's definition (if enabled in the Macro Options dialog), and you can override these values by defining your own project or global macros or environment variables.
</snip>
System macros are just that: SYSTEM macros. You can override them as described above.
Hope this helps,
Kevin
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