Is there a way to open a Mail attachment through Applescript?

Plan A: Standard "Open" command does not work.
Below is a simple script (what AS is great for...) to open every  
attachment among the selected messages

tell application "Mail"
set MList to selection
set AList to {}
repeat with myMessage in MList
set AList to AList & every mail attachment of myMessage
end repeat
open AList --> Script error from Mail
end tell

Plan B: Neither can I ask Finder to open it, because there is no  
property for a full path to the attachment file in the Mail folders -  
just the file name.

Plan C: Do I have to figure out how to save to a temporary folder and  
open from there? Ugh.

Any better ideas?
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