QB Issue Resolution:

.QBB indicates a QuickBooks backup. It can for the Mac or for Windows – there are two different .QBB variations unfortunately. If the accountant used the Copy Company File for QuickBooks Mac feature then they’ve used the correct one.

Resolution for Issue 'Conversion WIN to MAC problems' available: Yes (Solved).
Source: Intuit Community forum.

Conversion WIN to MAC problems: 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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