You can configure the Integration Service to run sessions with flat file targets in either ASCII or Unicode data movement mode.
If you configure a session with a flat file target to run in Unicode data movement mode, the target file code page must be a superset of the source code page. Delimiters, escape, and null characters must be valid in the specified code page of the flat file.
If you configure a session to run in ASCII data movement mode, delimiters, escape, and null characters must be valid in the ISO Western European Latin1 code page. Any 8‑bit character you specified in previous versions of PowerCenter is still valid.