I'm currently working on a VB6 front-end (I say front end, but it 450,000 lines so probably a bit more to it!) with C++ back-end (and it's old C++ that uses MFC containers instead of std). We also have a lot of C# extras that are called from the VB6 and also consume the C++ stuff.
Oh, and there is Python scripting in there somewhere too.
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