Thank you for posting your query here in the Community space, Brad.

To assist you in identifying which files can be safely removed, could you please provide us with the version of QuickBooks Desktop (QBDT) that your customer is currently using? This information will help us determine which files can be safely deleted.

Additionally, we recommend making a backup copy of their QuickBooks company file before deleting any files from their folder. This precautionary measure ensures that their data is protected in case any unexpected issues arise during the cleanup process.

Once you have confirmed the QuickBooks version they are using, you can proceed with deleting only the files that do not match their existing QuickBooks version.

Moreover, you may also want to check out this website to learn about the latest platform changes and stay up-to-date with releases, news, events, and more on QuickBooks: Intuit Developer page.

Let me know how things are going by leaving a reply below. I'm ready to provide any necessary assistance you may need.