A GTO file is a special format developed by Intuit Inc. It should be edited and saved only with appropriate software. A GTO file is used with Quicken financial software. The GTO format allows exporting financial data. The exported file can be viewed and referenced. The file should not be edited, similar to a PDF file. The GTO file name often contains the Quicken project name. The GTO file extension is associated with 268 financial and tax file types. GTO files can be created on Windows and Mac operating systems. The most common programs to open GTO files are Quicken and Quicken Essentials.