You may want to have a look at the _usermeta table for the wp_EE_Attendee_ID meta_key. The meta_value there will match the value for the CSV export’s Attendee ID[ATT_ID] column. There you can get the user_id from the same row to get the User’s ID.
It’s located in the EE_Export.class.php file. I can recommend using the FHEE__EE_Export__report_registrations__reg_csv_array
filter hook to add/remove columns. This way you’ll avoid altering the file directly.
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