I want to use the 'this.createDataObject' and this.exportDataObject' on Acrobar Reader DC.

As Try as stated, you cannot export a custom CSV file from Reader to the user's file system with JavaScript alone. Acrobat JavaScript is heavily restricted for security reasons, and Reader is restricted even more because it's a Reader.

If you want to do this you need to get Acrobat Std/Pro or use an indirect method,

Here are a couple of ides for indirect methods:

1. A VB/VBA program that uses the Acrobat IAC to call JavaScript functions for building and returning the CSV text. Then the VB program can write to disk, or if for example, it's a VBA script in Excel, it could just fill out a spreadsheet.

2. Submit the CSV data to a server script which saves the data on a server, in Google Sheets for example, or returns HTML to display the CSV data.

You can use exportDataObject in Reader, but not createDataObject, unless a very special type of right is applied to the file using the LiveCycle Rights Management application (I believe).