I'd be delighted to assist you with opening the original file in QuickBooks Desktop.
I have a few questions that I need to ask to ensure you'll be able to open the company file. Did you try opening the original file to a higher version of QuickBooks? Were you still able to access the new company file without any errors?
If the problem is only company file related, you can try following the solutions in the article I'm adding below (start with Solution 1):
I'm pleased to have you here again in the Community, @cr3ighton.
Thanks for letting me know the solutions you've performed as provided by my colleague, @AlcaeusF, to help resolve your issue. Other users will find this as helpful if they experienced the same error when opening a company file.
Feel free to create a new post here in the Community if you have other concerns. Rest assured, we're always here to help you out. Have an awesome day, @cr3ighton!