Compatibility of API applications with 64-bit Revit

Most API applications can be built with settings that allow them to be used either with 32-bit Revit or 64-bit Revit. Use the following settings to build your project in this manner:

• For C# project, go to project property->Build tag, select platform target as "Any CPU".
• For VB.Net project, go to project property->Compile tag, select platform as "Any CPU".
• For C++/CLI project, open property page and go to Configuration properties->General->Common Language Runtime support, select /clr:safe.

Note that there are some Microsoft components (such as OleDB provider for Microsoft Jet) that are not supported for 64-bit. All SDK samples are set up to work with either 32-bit or 64-bit Revit, except those samples that have dependencies to unsupported Microsoft components.

For more information see this Microsoft resource:

http://msdn.microsoft.com/en-us/library/ms241064(VS.80).aspx