Hi
Ok, let me clarify that I had returning resident permit before 2003 and then I got a PR card, so my PR card will be valid.
If my PR card is valid, can I apply for my spouse outside the country?
Can I enter the country for a few days, apply for her card and then leave?
It is not the validity of the PR card, it is the validity of PR status. So if you left again sometime in 2003, and not returned, then your PR status is gone sometime in 2006.
To sponsor your wife, you would have to resident in Canada, no you can't stop off for a couple of days and submit your application.