You are correct...

  pauldonovan 14:02 05 May 2005

..IrFanview has overwritten your associations.

You could re-associate them by hand but i've just found this (haven't tried it myself) which has a button that purports to default all your associations for image files.

The alternative is to uninstall irfanview which i suspect will put them back as they were...I'd be tempted to go for that.

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