To change the output file extension for HTML or XHTML:
[Setup]
FileSuffix = .ext
For DITA or DocBook output, see:
§15.2.3 Specifying DITA output options
§17.2.3.1 Changing the DocBook output file extension
13.2.3 Preparing a document for conversion to HTML or XHTML
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13.2.5 Checking automatic settings for HTML or XML split files