[Vpmedia]

Imho they should not exceed the filesize of 3 Mb

for example 1024*768*256 colors = 768 Kb try that first

these should work to if you need tested files: http://www.filefront.com/12579976/gui.zip/

correct path is c:\Program Files\Ubisoft\IL-2 Sturmovik 1946\MODS\something\gui\background0.tga