converting from quickbooks to quicken

Hello! we are currently in the process of converting from quickbooks desktop to quicken. i have been trying to tranfer our chart of accounts and vendor list all day with no luck. i am able to export from quickbooks seamlessly but making the import is giving many issues. i am unable to save the file as a csv or qif. it is currently a IIF and when trying to locate it says theres an error. any help greatly appreciated!

thanks!