Release of the Open XML SDK version 2.6

I’m happy to announce the release of the Open XML SDK Version 2.6 on

This new version has fundamentally the same functionality as 2.5, except that it is built by default using the new System.IO.Packaging, which is based on System.IO.Compression, and resolves the bug that can occur when two threads or executables exceed a 10MB threshold within the classes in System.IO.Packaging. For a screen-cast that discusses the bug, and the approach I took to give this new module reliability and performance, see Announcing the Release of a New Implementation of System.IO.Packaging.