Thank you very much Jonathan
Please let me know if I am getting it right. I would process the file in an ordinary folder (e.g. c:\temp), then I would set it as an output parameter (e.g. arcpy.setParameter(1, c:\temp\txtfile.txt)) and finally, once the task is finished, the system itself would copy that file to the GPService output folder (which is a virtual directory too) and send a link back. Am I right?
Is there any help topic in which I could find a clear directive on this topic (output parameters in GPService)? I have been trying by myself, but couldn't find any
Once again, thank you very much in advance
Regards,
Sebastián