[Python.NET] Binary file passed to .Net object

Hello, guys here is a prototype code: exAsseblyRef = clr.AddReference("C:\ExamRecordHelper") from ExamRecordHelper import * loaderObj = ExamRecordLoader( 'MyBinaryFile.bin') <<<<<< Exception here. On the 3d line the C# constructor ExamRecordLoader(String) is called - it can't create the object. The actual exception is: "Column requires a valid DataType." However, the same binary file used with native C# code: ExamRecordLoader( 'MyBinaryFile.bin') works with no errors. Obviously something is happening when the binary file is being used by the C# class... Any suggestions? Thanks, Alex.