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XAML Browser Applications (XBAP, pronounced "ex-bap") are Windows Presentation Foundation applications that were intended to run inside a web browser such as Firefox or Internet Explorer through the NPAPI interface. They had a .xbap filename extension and a MIME type of application/x-ms-xbap. The phasing out of NPAPI and lack of support for the file format mean that there are currently no browsers that support XBAP applications.

Hosted applications run in a partial trust sandbox environment and are not given full access to the computer's resources, like opening a new network connection or saving a file to the computer disk; furthermore, not all WPF functionality is available. The hosted environment is intended to protect the computer from malware; however, it can also run in full-trust mode by the client changing the permission. Starting an XBAP from an HTML page was seamless, with no security or installation prompt. It ran in an out-of-process executable managed by a virtual machine.

External links

• XBAP at Wikipedia