With further testing, I notice that the opening/closing of Word document is different between IE6 and Firefox1.5 :
in IE, it is as described above, i.e. the document is NOT named when opening therefore you get the Save as... dialog
in Firefox, the document is named doc9999.doc, gets written in the user's temp folder. On closing, you get the Save doc9999.doc dialog (Yes-No-Cancel). If you say Yes, the doc9999.doc in temp folder gets updated. The form displayed in the BS is the autogenerated "Please click here to see the document" + Back button. If I click Here again, the original (from template) document will open up in WOrd with name doc9999-1.doc
So really, I don't know who is doing what in that case. But I need to have a solution (replace MS Word with OpenOffice or an HTML editor or whatever).
Thanks in advance for any proposal.