What I was trying to say is that you will never get this to work using ttx files. Thus ADO .NET Datasets which will work both in 32 and 64 bit. Using System.Data,DataTable should work. See:
c# - Report asking for database login on setting DataTable as DataSource - Stack Overflow
You may want to create a dataset and see i that will work for you. We can check if the dataset is valid by following this:
- Ludek