QB Issue Resolution:

First make sure the Accountant gave you a file that was created with export to Macintosh. The file extension is .qbb but that can either be a Mac backup or a Windows backup. You want the Mac backup.

Second, check the file size and make sure its a reasonable size. Sometimes files get cut up during transmission over email or other routes.

Resolution for Issue 'Error “there was a problem converting this file” when I try to open a backup file' available: Yes (Solved).
Source: Intuit Community forum.

Error “there was a problem converting this file” when I try to open a backup file: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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