"Working" isn't really the issue. It's not provided for at all. You might still be able to get Intuit file services to help, if the client wants to move to QB Enterprise:

https://http-download.intuit.com/http.intuit/CMO/qbes/resources/pdfs/convert_from_easyacct.pdf

I haven't needed this service for years, so I don't know if they still offer it.