The Quicken data file primary extension is QDF. Auxiliary files contain supporting data. From Quicken 2010 for Windows onwards, there are no auxiliary files.
Quicken 2017 and newer use QDF. Quicken ...
The Quicken data file primary extension is QDF. Auxiliary files contain supporting data. From Quicken 2010 for Windows onwards, there are no auxiliary files.
Quicken 2017 and newer use QDF. Quicken for Mac uses Quicken[version year] format.
Unsupported versions – Quicken 2010 to 2016 – use QDF. Quicken 2005 to 2009 use QDF, QEL, QPH and IDX. Quicken 2004 uses QDF, QSD, and QEL.