Many board houses prefer the RS274X format, which is also called 'Extended Gerber'.
The difference to the 'old' Gerber format is that it is not necessary to generate a wheel file. The aperture definition is part of the data file.
This simplifies matters, because you do not need to worry about a separate wheel file.

For a 2-layer board you can use a pre-defined CAM processor job file.

After starting the CAM processor 

Load the related BRD file via FILE/OPEN/BOARD. 

Load the file 'gerb274x.cam' via FILE/OPEN/JOB. 

Start the job by clicking 'Process Job'. 

This job does basically the same as the 'gerber.cam' job (Generating Gerber Files), with one exception:
There is no separate wheel file, since the aperture information is stored in the data file. 

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