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Structure
See the architecture.
Path structure
Path structure is defined inside BlogSettings.AppPathInfo.
Editing
You can open and use GUI (Windows), or use console app (All platforms) by adding files manually.
Converting
GUI application contains convert button, but you can use command line too. The API is same anyway.
Reading
Since the result is bunch of simple static files, you can read it by your own way
Even if the reader doesn't officially exist in your language, it's easy to make your API from the file format.