I have bounced here after trying a few other places. It seems to me that any mod built on top of WOC will crash when loaded in vista or windows 7. For background see the BUG bug thread at this post and again at this post, and also this other thread. I believe the problem comes because the interface theme module writes a file deep into the subdirectory tree under the mod. But, a normal user is not allowed to write into program files, so the game crashes during "init xml". Although the mod I am working on, Dune Wars, uses WOC, I was not exposed to the early stages where WOC, RevDCM, and bunch of other stuff got merged together. Can you please point me at an explanation of the file assets/modules/interface/dune theme/resource/civ4.thm ? The "dune theme" is obviously part of the Dune Wars mod. But, the game writes this file during initialization, which is preventing vista users from starting the mod. So I would like to do "something" to avoid using this file. Knowing nothing about the modular loading structure, I came across file assets/modules/MLF_CIV4ModularLoadingControls.xml, which has a section Code: <Module> <Directory>Interface</Directory> <bLoad>1</bLoad> </Module> I changed 1 to 0, but this causes a lot of the interface aspects of the mod such as fonts to go back to vanilla. So this is too large a change. There are over a thousand downloaders of Dune Wars, and this is the #1 reported problem. Nobody using vista or windows 7 can play the mod at all unless they know the secret workaround. I want to find a solution, not a workaround.