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Hi there, @melissayahn.
Please allow me to join the thread and help you open the file successfully.
To open the file successfully, you must open an Excel and drag the file or the IIF file to Excel.
You can see attached screenshots for additional reference.
On the other hand, to learn more about importing/exporting IIF files, you can check this article: Export or import Intuit Interchange Format (.IIF) files.
Please know that I'm always here to help you if you have any other questions about exporting/importing IIF files. Have a wonderful day ahead!