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ArcGIS 9.3 will not support Visual C++ 6.0. In fact, ArcGIS 9.1 was the last release that supported it. However, if you want to do COM Visual C++ development at ArcGIS 9.2 and 9.3, ESRI will support that language via Visual Studio 2005 (not Visual Studio 6). For additional information, please visit the system requirements page.
