There is only one file type that uses the .T14 extension:
H&R Block 2014 Tax Return
Tax return created and used by H&R Block 2014 tax software or exported from H&R Block online; contains U.S. federal tax forms, along with any necessary state tax forms for 2014; stores personal data and tax information entered by the user that can be worked on at a different time.
NOTE: When you complete your tax return, it can be electronically filed directly from the H&R Block software or H&R Block Online. You can also print the return and mail it to the appropriate tax authorities.
Updated: September 13, 2015