not .QFX. You need to head to the upgraded .QDF file in a folder named Q18Files or Q17Files, which is at the same location as your original Quicken file. The .QDF file might also have the same name as the original data file. ...
2qfx Convert Pro Powerful collection of financial file converters for pro users to extract transactions from PDF statements and other source formats into Quicken. Convert transactions from PDF, CSV, QIF, Excel or native QFX files into either the QIF or QFX formats. ...