Much of the logic for repeating of build rules (for non-Process Files actions) and the Process Files action is built into the builder component, so it's not currently possible to create a user-defined action that uses some other type of iterating functionality.
See 'user actions' in the help index for details on creating user-defined actions, and also the samples in the Samples\User Actions folder. See 'object model' for details on the COM objects and properties that are available from a user-defined action.
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