The characters tt are sometimes used as shorthand in coding (like teletype in HTML/documentation) or for specific private tools. Security Warning
In the context of TurboTax , "K" and "TT" frequently appear together in discussions regarding Schedule K-1 and tax reporting. A file named this way might be a backup of tax data or supporting documents. K - T T.zip
Could you share where you or its approximate size to help narrow down what it might be? The characters tt are sometimes used as shorthand