Mac Desktop 2019 Mac OS Sierra / Mojave

Thanks for reaching out to the Community, @mv61.

Let's try a few troubleshooting steps to see if you can access that company file!

It's possible the file is located in a restricted location or that the folder permission is not set up properly. It could be also the folder where the company file is saved has a damaged component. 

You'll run the QuickBooks File Doctor to fix issues when opening your company file. Just follow the steps and details in this article: Fix company file and network issues with QuickBooks File Doctor.

If the same thing happens, please run your program as the Administrator. Just follow the steps in Solution 2: Set QuickBooks to "Run as Administrator" in this article: Message: You do not have sufficient permissions to the specified folder.

Then, proceed to Solution 3: Move the company file to the default location until Solution 5: Test and Set folder permissions if the problem persists.

I'd love to know if this results in a successful opening of your file! If not, please let me know so we can explore other solutions. 

QuickBooks File Doctor is windows ex file not for mac

It does sound like a permissions issue. Locate one of the files that won't open up in the Finder. Then copy it to your Documents directory on your main hard drive. Once you've done that, drag the copied file onto the QuickBooks Mac application icon and see if it opens.  If it does the issue is permissions on those external hard drives.

You can also examine the permissions on a file by selecting the company file in the Finder and choosing File->Get Info.  The permissions are down on the bottom. QuickBooks needs both read and write permissions for the current logged in user .

There is a macOS option to open up permission access on other drives. I think its accessible by selecting the drive on your desktop and then choosing File->Get Info.  There's a checkbox for "Ignore ownership on this volume".  If that's off you may want to try turning it on. 

It could be something else, too, but given the many hard drives lets start there.

Thank you  for all your help I did get it open  for some reason it moved a file from my old drive after it was open in in the other OS then took that drive out of the mac made sure it opened in the old OS Then I replace the App in the new OS with old Mac OS  , then I started Mojave back up and it worked  

thank you