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The file browser simply display files in categories based on the mimetype declared for them in the OPF. If you edit the OPF to change the mimetype then next time the files browser is refreshed they should move into text automatically.
One way to force the files browser to refresh is to run check book, it will complain that the files extension does not match its mime type, tell it to fix that by changing the mimetype and the files browser will be referesh after the fix is done.
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