Preprocessing is a reverse engineering option you can enable or disable.
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Select .
The Reverse Engineering VB .NET dialog box is displayed.
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Select files to reverse engineer in the Selection tab.
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Select reverse engineering options in the Options tab.
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Select the Enable preprocessing check box in the Preprocessing tab.
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Select symbols in the list of symbols.
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Click OK to start reverse engineering.
When preprocessing is over the code is passed to reverse engineering.