I don't think there would be too many users on this forum with much experience on that software. Editing files across different applications is fraught with problems but that doesn't mean there won't be a solution available - you just need to find someone, somewhere in the world that has done what you are trying to do.

You will probably need to ask that question on a Nisus Writer Pro forum or perhaps on a Mac-specific site where people may be more likely to have experience in Nisus.

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Andrew Lockton
Chrysalis Design, Melbourne Australia