Exception on getting PackageId

Question

I have a WPF app that I have converted to a bridge app. In this app I want to offer the user a function to open any installed store app in the store. For this I need the ProductId of an app to create the following url:

ms-windows-store://pdp/?productid=<ProductId>

I have tried the following. Unfortunately I get an InvalidCastException when accessing Package.Id.

PackageId packId = AppInfo.GetFromAppUserModelId("Microsoft.3DBuilder_8wekyb3d8bbwe!App").Package.Id;
string productId = packId.ProductId;

System.InvalidCastException in mscorelib:

The object of type "Windows.ApplicationModel.PackageId" cannot be converted to type "Windows.ApplicationModel.IPackageIdWithMetadata".

at System.StubHelpers.StubHelpers.GetCOMIPFromRCW_WinRT(Object objSrc, IntPtr pCPCMD, IntPtr& ppTarget)
at Windows.ApplicationModel.PackageId.get_ProductId()

Is there possibly another way to get the ProductId of any application?