The SQL Comparison SDK assemblies are compiled as "any CPU" as of version 7.1, however, any reference to the RedGate.SQLCompare.BackupReader assembly will require your application to be compiled as 32-bit, as this assembly has got the 32-bit flag set. You can compile an SDK application on a 64-bit machine as a 32-bit application, but the Visual Studio environment needs to be adjusted to compile your project in 32-bit mode.

For more information, see: Licenses.licx is not a valid Win32 application