Windows Live Writer includes an application API that external applications can use to launch Writer in order to create new posts, to open existing posts, and to support "Blog This" operations for various content types including links, snippets, images, and feed items.
The Writer Application API is available using a COM interface (WindowsLiveWriterApplication COM Class) defined in the type library "WindowsLiveWriter.Application.tlb" (located in Windows Live Writer's Program Files directory).
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