If you mean codes such as values for document type (IN, CN DN, or possibly just 1, 2, 3, etc), then there is a tool called the DataDictionaryExporter.EXE that can do this. This utility can be found in the \softrak\system directory, and can create a spreadsheet for a specific Adagio program and one tab for every data file. If there are any 'translated values' coded in the dictionary, they will be listed here, at the bottom of each sheet.
If you don't find the 'return codes' you are looking for, or if this does not answer your question, please re-post here an example of specific information you require and perhaps what you mean by 'return code'.
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Regards,
Softrak Tech Support