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It won't look bad at all. In fact, the opposite. Joint bank accounts are good things in spousal sponsorships.
 
thanks!
rjessome could you also look at my questions here:http://www.canadavisa.com/canada-immigration-discussion-board/some-final-questionsalthough-im-sure-ill-have-more-help-please-outland-t27483.0.html
 
I am on TRV here too and our file is in process. Two months ago we opened a joint account in Canada and it was actually recommended to us by the visa office.
 
I opened a Bank account when my wife was here visiting this month. It actually provides evidence of a relationship