custom themed module's file

In some module I found the possibility to copy a module's file in my theme directory to create a custom themed file.
But with acquia_marina this feature doesn't work. The acquia_marina theme always loads the module's files stored in module's folder, not the module's files saved in acquia_marina folder. With other themes all runs well, why not woking with acquia_marina?
Can you help me? (if you understand my english)