Ax 2012 R3 Positive Pay Output file extension to CSV.

HI ALL,

I am working on ax 2012 R3.

I have requirement to setup positive pay for bank.

I have managed to do all the setups and able to generate output file as xml file with bank details ,for this I have provided the XSLT file as an input. 

Now I have to generate the CSv file instead of XML..for this I dont know how to change the extension of out put file.

I have tried below XSL output method to change the extension but no use still I am getting XML file.

<xsl:output method="text" encoding="utf-8" omit-xml-declaration="yes"/>

Please suggest if you have any idea how to change the extension of file.

Thanks

Haribabu