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Visual Studio
A family of Microsoft suites of integrated development tools for building applications for Windows, the web and mobile devices.
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As you have already seen, vb 6.0 SP6 will not install on a system that doesn't already have the VB6 product installed. VB 6.0 has never been a free download. It is available with a paid subscription.
The author of the VB6 executable that requires comdlg32.ocx should have distributed it and any other dependencies along with the application. Perhaps you need to re-install or repair that application on your system.