CSV Export not using correctly formatted attribute names

Hi, I'm trying to set up an automated task that reads from a .csv that ADManager creates. The two columns in the report are SAM Account Name and a custom attribute (extensionAttribute3). What I find is that when ADManager runs the report the column headers are whatever AD Manager has listed for the attribute. So in this case for SAMAccountname it exports as SAM Account Name in the .csv, thus the automation modification task can't run because there are spaces in the attribute name. How can I fix this? I notice it's the same for all other attributes (e.g. DistinguishedName is Distinguished Name, DisplayName is Display Name, etc.)

Thanks!