I know it's a long shot but I was hoping that one of the "lifers" still might have the skin in their archives. It was originally uploaded to the old IL-2 skins website.
There is a link to the skin at Keith77's old webpage at the Internet Archive but unfortunately it leads nowhere.
(click on the "IL2/Pacific Fighters" link.)
I did find this thread at check six from 2004 by Dunmer discussing 236 squadron Beaufighters that might include the skin in question but once again the links in the thread lead to the now defunct IL-2 skins website.
Beaufighter RAF, Squadron 236 en juin 44: www.checksix-forums.co...p;t=101283
The skin I am trying to find was used on a Beaufighter Mk21 for the "Convoy strike at Le Havre" download.
Convoy strike at Le Havre: www.mission4today.com/...amp;id=739
I opened the .mis file and found the file name for the skin.