In order to use Visual Studio 2005 you could switch to the old version of OpenAcess ORM menu and visual tools as described by this documentations article
. As this feature is deprecated as part of the OpenAccess Classic I would suggest an update to Visual Studio 2010, 2012 or 2013 which would allow you to use the contemporary features of OpenAccess ORM added in the last 5 years.
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OpenAccess ORM Q3 2013 simplifies your model operations even further providing you with greater flexibility. Check out the list of new features
shipped with our latest release!