I'm here to help, kardolder.
We sort things out in the permission settings. To guide you further in opening the QuickBooks file, I would suggest visiting this article as it contains further details and steps on how to do it successfully: https://support.apple.com/en-ph/guide/mac-help/mchlp1203/mac.
I'll be around to help. Just let me know if you need assistance. I want to make sure that you're all set. Take care!