MAC user cant open files sent from a certain outlook user

I'm sure this question has been asked and answered many times over, yet I couldn't find anything in search results. We (my office) are using Outlook 365, we do have office 2010 installed on each client machine, but ultimately all the mail routes through the cloud, we have 1 user also on Office 2010 however that sends to a mac user that receives their attachments as Winmail.dat, despite us sending the files in .xlsx or .pdf, yet if I send the same file or if it is forwarded to me by the user sending the file they can open with no problem.

I tested sending this mac user through our problem client in both HTML AND Text Format, mac user received winmail.dat in both cases, yet sent from my client in both formats opens for them.

Help please
Jeremy KirkbrideAsked:
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This article will explain what is happening and what can be done on the Windows end:

On the Mac end, the user can install an app like TNEF: to read winmail.dat files.

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