What is your ultimate goal ? i am hoping that you want to store the Collection values as a CSV file, if that is the case you can follow below steps.
1. Create a single row collection with one field.
2. Use Utility String VBO - > get collection as CSV action.
3. in input provide your collection, in output provide your single row collection field name, note that it is a text field not collection, use collectionName.fieldName
4. Next stage should use Utility File Management VBO - > Write Text file action, input your file name *.csv, in Text input parameter enter your single row collection, use collectionName.fieldName.
Run the process you should be able to write the collection as CSV file, comma seperated.