sounds interesting.. and shows once more how dangerous custom development can be when it is uncontrolled and not well documented.. I remember a similar case years ago where I had to get back in touch with a former partner the company had ditched for bad practices and needed them to upgrade a custom dictionary to accommodate just the new release number.. They wanted to charge us for that, but I gave them some s****t as I told them that the company had fully paid for that dev and was actually the owner of the module.. they ended up dropping the invoice.
it could be that there is more than just the DYNAMICS.dic file involved in this dev.. maybe some other HR/PR dictionaries ? I could try extract them as well.. just need a # as reference.. (i.e HR should be 414, but I don't know for US PR).