The free WSI Client application is being rewritten to run as a native Windows 8 client. It is still a work in progress but the framework is now complete and the backing code is being migrated across. The biggest challenge at the moment is finding an XML code editor control that works in .NET Core.
I have been using the WSI Import Tester from AspDotNetStorefront for some time when testing out new XML messages or just trying to figure out some functionality and always wished I could save the connection settings and reload XML test cases more easily.
This desire has grown into the build of an entirely new Windows Client that does everything I need. I suspect there are others that would like something similar so I intend to release the program for free to anyone that asks for it.
It is now ready – you can read all about what it does on the WSI Client product page along with a link on how to download a copy for free.