RE: Help! How do I add product properties?

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http://forums.oscommerce.com/viewtopic.php?p=198298#198298
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I tried out that contribution, but could only 1/2 get it to work - it's for an old version of osCommerce I think because it refers to 'default.php' instead of 'index.php'.

The reason I can't make it work it because you have to edit 
catalog/includes/modules/product_info.php
but this file does not exist in my version (I just downloaded osCommerce-2.2ms2 today)

Does anyone have any idea where the code that used to be in catalog/includes/modules/product_info.php has gone? (Or whether there is a newer version of this contribution?)

Code is:  $define_list = array('PRODUCT_LIST_MODEL' => PRODUCT_LIST_MODEL,  etc...

case 'PRODUCT_LIST_MODEL':        $select_column_list .= 'p.products_model';
                                          break;

This kind of thing.

Thanks for your help,
Louise