MSG email files attachments preview is broken on List View

Issue Summary

.msg files attached to an issue can't be previewed if the attachments are on 'List View'

Steps to Reproduce

1. Upload a *.msg. file to an Issue in Jira
2. Switch the 'Attachments' view to 'List View'
   
3. Try to click on the .msg attachment to preview

Expected Results

The .msg file is able to be opened to preview

Actual Results

The file will show as 'Can't be previewed'

Interestingly, the preview works if the 'Attachments' view is switched to 'Strip View'

Workaround

Switch the 'Attachments' view on the issue to 'Strip view'