Oracle Designer is not supported in Windows 7. But, you can install and use it. There is however (at least) one bug.

When Oracle Designer generates a Forms module it calculates the width of items based on the system font size. And there is where it all goes wrong... somehow it grabs somewhere a system value and - when upgrading from an older MS Windows version - all your screen items become smaller, possible resulting in not fully displaying the item's content.

In fact there's no problem when you start using Oracle Designer for the first time and you install it on Windows 7. But, do these people exist? ;)

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