QB Issue Resolution:

You need access to a Mac.  Using QB Mac, you can create a windows file to use (as can your client.)

See https://qblittlesquare.com/2014/09/mac2win2015/

Resolution for Issue 'I have a QuickBooks Desktop for Mac .qbmb file from a client. how can i convert it to QuickBooks Desktop for Windows? I do not have access to a Mac computer.' available: Yes (Solved).
Source: Intuit Community forum.

I have a QuickBooks Desktop for Mac .qbmb file from a client. how can i convert it to QuickBooks Desktop for Windows? I do not have access to a Mac computer.: 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.

Support for Mac computer
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Error Recovery for Mac computer [Canada]
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