Welcome to our community, Anil
RoboHelp will NOT work with Open Office. But that doesn't mean you cannot use it. RoboHelp comes in two flavors. RoboHelp for Word and RoboHelp HTML. The more popular of the two is RoboHelp HTML. Only if you intend to produce Printed Documentation from RoboHelp HTML is Microsoft Word needed. Of course, if you wish to use RoboHelp for Word, you are expected to have Microsoft Word installed.
Hopefully this helps... Rick
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Thanks for clearing my doubts Rick