Open the BACSFormats.config file which is usually located at "c:\program files (x86)\Access Applications\Dimensions\Accounts\[dimensions version number]\Extras\".
Locate the entry for the BACS Payment type that is to be changed. For each payment type there is a number enclosed in square brackets and the name to the right of the number. (for example "[10] ' RBS Bankline")
Change "ExportCSVasTXT=N" to "ExportCSVasTXT=Y" for this entry.
Save the file.
