Tried it with the "full" Toad Extension for Visual Studio and also with the headless build version.
"C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\TeamData\Quest Software\Oracle\Quest.Data.Schema.OracleTasks.targets" (74): "The "OracleBuildTask" task could not be loaded from the assembly C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\TeamData\Quest Software\Oracle\OracleDsp.Tasks.dll. Could not load file or assembly 'file:///C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\TeamData\Quest Software\Oracle\OracleDsp.Tasks.dll' or one of its dependencies. An attempt was made to load a program with an incorrect format. Confirm that the <UsingTask> declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask."
Tikra, This really looks like an installation problem. I have a couple of configuration questions? 1) Is Visual Studio in the C:\Program Files (x86)\Microsoft Visual Studio 2010\ directory? 2) Is MSBuild in the C:\Program Files (x86)\MSBuild directory?
These are the standard locations, for a regular Visual Studio install.
Try uninstalling the Toad Extension, and reinstalling it. If that doesn't work try uninstalling, then running the Uninstall.bat file (twice!) in the attached zip file, then reinstall the Toad Extension.
I need to warn you that the Uninstall.bat file needs to be run in a cmd.exe shell that has administrator privileges. It removes registry settings and folders used by the Toad Extension. We use it during development to completely clean our workstation.