使用Visual Studio 2008的SharePoint 2007 x64工作流程？

I have development environment with 64-bit SharePoint 2007. I tried to create SharePoint workflow with Visual Studio 2008 and got error message "A 32-bit version of SharePoint Server is not installed. Please install a 32-bit version of SharePoint Server". Is there any way to solve this problem?I have development environment with 64-bit Shar