I need to print my 2018 taxes but it is listed as .ttbk.  Please tell me how to access the file.  Thanks.

Follow the steps in these links to retrieve your 2018 return:

https://turbotax.community.intuit.ca/community/tax-return-print-save/help/how-do-i-print-save-a-copy...

https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...

If you still have issues after following this process, please contact our support line:  https://support.turbotax.intuit.ca/contact/

I hope this was helpful