Introducing the WPF Web Browser Application!
.wbaand the new MIME content type is
application/x-ms-wba. If you've installed the new WinFX bits and the Visual Studio Extensions for WinFX, you'll see project templates this.
Why did we make this change? Well for starters, the names were always working names. Also it turns out
xappis trademarked (by SAP, I think). And we don't want to confuse Express apps with the Express SKUs (as in Visual Studio C# Express edition). In no way are Web Browser Applications lite versions of WPF applications. So that misapprehension had to be removed.
This new name isn't cool, so why choose it? That's because the coolness of the Windows Presentation Foundation can and will speak for itself. It does not need the name to be its crutch. Besides, this name is generic enough that it cannot be trademarked, yet very accurately describes what that flavor of WPF application does.
I've heard a few people on the team here at Microsoft refer to Web Browser Applications as webbahs and for the record, I severely dislike that term. I know we do it with XAML (pronounced zammel) but let's just stop there. Please.