Recommended Strategies on Preparing for Windows Vista
Many of the changes and new features in Visual DataFlex 2008 will help to prepare applications for Windows Vista. Preparing applications in this way will concurrently improve them for Windows XP. Also, a Vista environment is not needed to make changes for Vista. all of the changes in Visual DataFlex 2008, and suggested improvements in your applications, can be made using Windows XP. Specifically, you can prepare your applications for Windows Vista while still developing on Windows XP.
It is recommended that you upgrade to Visual DataFlex 2008 as soon as possible and prepare your applications for Windows Vista even while you are still developing on Windows XP/2000 so that you can be ready whenever your customers demand deployment on Vista.
While it’s recommended that you read in its entirety the Visual Dataflex 2008 information about Vista, here is a short list of recommendations and links to the key points:
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Upgrade to the latest version of Visual DataFlex. Just by migrating your workspaces to Visual DataFlex 2008, you have already performed much of the work in preparing your applications for Vista. Visual DataFlex 2008 is the first revision to fully extend support for Windows Vista as a development and deployment platform. Some of the issues you might face in your applications are addressed automatically as part of migration.
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Design your applications so they can run with Vista’s Standard User privileges. This will enable your applications to run with Vista User Account Control (UAC) enabled. Visual DataFlex 2008 has been designed and tested with UAC enabled, and just by migrating to the latest version, and in some cases minor adjustment to your code, your applications will operate appropriately with UAC enabled. In particular...
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Make sure your application does not write to protected file system locations, or protected registry key locations.
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Avoid File and Registry Virtualization by making sure your manifest files are up to date.
Download the complete "Preparing for Vista" document. 
Many of the changes and new features in Visual DataFlex 2008 will help to prepare applications for Windows Vista. Preparing applications in this way will concurrently improve them for Windows XP. Also, a Vista environment is not needed to make changes for Vista. all the changes in Visual DataFlex 2008 and suggested improvements in your applications can be made using Windows XP. You can prepare your applications for Windows Vista while still developing on Windows XP.
Preparing for Vista