Outlook doesn't care about which application you open your attachments with.
The issue most likely is with your default jpg-handler.
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Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
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"Yobnoj" <(E-Mail Removed)> wrote in message
news:B1FDF2E4-F1F2-4CF0-8DBF-(E-Mail Removed)...
> When I attempt to open a jpeg file from a message in outlook 2003 I
> receive
> an error message saying Application not found