Currently I have a WPF application in C#, but I\'m finding it to be incredibly difficult to find any useful ways to embed a PowerPoint presentation into my window.
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Launching the presentation via the command line with the /s flag will play the slideshow without launching the splash screen.
powerpnt.exe /s c:\path\to\your\presentation.pptx
I would try that in concert with some of the WPF embed solutions you've mentioned or taking a look at this approach.
I know little about WPF, so hopefully someone can provide a better answer incorporating all these pieces.