There is only one file type that uses the .TT11 extension:
TurboTax Canada 2011 Tax Return
Tax return created with the Canadian version of TurboTax 2011; contains tax information for the 2011 tax year; includes the federal T1 form as well as other necessary forms such as the TD1 and T1-ADJ forms; also includes required provincial forms for the user's province.
Since TT11 files contain data for the 2011 tax year, they are most likely created in 2012. Completed TurboTax Canada tax returns can be printed and mailed or file electronically.
NOTE: TurboTax Canada 2010 files are saved with a .TT10 file extension.
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Updated: October 10, 2011