How can one get Visual Studio 2005/2008 to reference assemblies in the 64-bit GAC instead of the 32-bit GAC? We are settin the target platfom to x64 and the compiler is throwing the error of

Error 2 Warning as Error: Assembly generation -- Referenced assembly 'System.Data.dll' targets a different processor Common

Error 3 Warning as Error: Assembly generation -- Referenced assembly 'mscorlib.dll' targets a different processor Common

Error 4 Assembly signing failed; output may not be signed -- The system cannot find the file specified. Common

Update 29 Dec 08

Been trying out Aaron Stebner's suggestions to place 64-bit assemblies onto an isolated location (e.g. C:\Windows\Microsoft.NET\Framework64\v2.0.50727\GAC_64) and creating additional entries in the registry like HKLM\SOFTWARE\Microsoft.NETFramework\AssemblyFolders\GAC_64 or HKLM\SOFTWARE\Microsoft.NETFramework\v2.0.50727\AssemblyFoldersEx\GAC_64 but Visual Studio 2005 is still not picking it up....