I have to assume, that the RDS farm/fields name with numbers have already been linked the Farm/Fields existing with the desktop software, thus why do you not have an option anymore to simply setup New C/F/F names. So to edit manually those farm and field names go to the Red Barn tab. Right click on Farm or Field Name and select Properties. You can change the description box to match what is being used on the console and click OK.
With reading in the .X## file, do you get some sort of error or message, can I have more detail as to why it fails?