SQL Import/Export defaults to byte stream on export
When you retrieve or load data, SSIS tries to automatically convert it to the correct types. If SSIS can’t implicitly convert the data—and transforming the data within the package doesn't work—you might need to modify the XML mapping files (C:\Program Files\Microsoft SQL Server\110\DTS\MappingFiles -- folder), stage the data so it’s compatible with both SSIS and the data source, create a custom component that can retrieve or load the data, or implement a solution outside of SSIS to prepare the data. 

SSMS on the background creates an SSIS package. At the end it will even allow you to save it as an SSIS package.