When trying to open a word document from iinsight and you choose Open with: iinsightIINLuncher.exe and check - "Do this automatically for files like this from now on”:

It still keeps asking you what should Firefox do with this file?

When you try and change the settings in Home Icon/Firefox settings/Applications Tab/IIN File/ choose iinsightIINLuncher.exe/OK:

It still forces you to choose each time:

It still opens ok though and is a characteristic of Firefox, not a bug.

Emailing a document from the Documents tab:
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Then you get asked every time which program you want to use even if you choose “Do This Automatically for Files like this from now on”:

It will still work though and email to PDF.