How to use Bank2QIF to convert a QFX/OFX/QBO/QIF file?
Start Bank2QIF, it will show the file dialog to locate a one or more of QFX/OFX/QBO/QIF files. Click on the file (or hold CTRL and click on more than one file to select multiple files) and click Open on the file dialog.
Select QIF target (Quicken, MS Money, Quicken for Mac, Quicken before 2005, etc.)
For Quicken target, click on the Account Mapping tab and enter the account name as it is in Quicken for each account (these entries will be remembered and you have to do it only once).
Return to the Transactions tab.
Click the Save button to save loaded transactions to QIF file.
How I should import a QIF file that Bank2QIF created under Quicken 2005+ (including 2017)?
Start Quicken and click File, then File Import, then QIF file.
On the import screen, select 'All accounts' from the account drop down list. Ignore message about QIF limitations.