https://community.tibco.com/wiki/tibco-spotfire-sbdf-library
The TIBCO Spotfire® SBDF Library is a programming library for reading and writing files in the Spotfire Binary Data File (SBDF) format. The library can be used to add support for this format to an application, enabling it to natively create and consume data in a way optimized for analysis in Spotfire. The library is available for both .NET and Java applications.
Note: If you are writing an Spotfire extension you should not use this DLL. Instead, use the DLL provided by the Spotfire SDK.