There is only one file type that uses the .T10 extension:
At Home 2010 Tax Return
Tax return created with H&R Block At Home 2010 tax software; contains a U.S. federal tax return for the 2010 tax year; may also include an individual state return if the user downloaded an At Home state edition.
T10 files contain data that is entered in official tax forms. These tax forms can be printed or filed electronically with the At Home software.
H&R Block At Home 2010 is available in Basic, Deluxe, Premium, and Premium & Business editions.
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Updated: February 14, 2011