Hello,
The .cor file is generate when you go through the Efile steps, the second last step before Efile will be the creation of the .cor which will either give you a successful message with a green check mark or a red X which indicates there is a problem in the file. If you are getting the green check mark the .cor file should be situation in your document under the My ProFile data folder then in T2 return and Efile.
