Combat Commander Extensions

How do I get CC extensions to load up. I get the main game but not the other expansions. I know an extension file is needed but how or what should I name it?
I’m running the latest Vassal on Windows XP

After you have d/l the extensions, start up Vassal. In the module manager,
right click on the Combat Commander module, select add extension. Browse to
where you d/l the extension to and select it. Extension will be added by
Vassal. Rinse repeat for any other extensions you wish to add.

Same process for all modules

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With your help I managed to get the extensions to work.