Also, this site gives you really useful info sometimes like in this case where it says you can convert NRG files to standard ISO files using a program called Nrg2Iso. NRG and got the following results:Īt the top, you see it is a Nero CD/DVD Image file and you get a short description of exactly what the file might be. Just type your extension into file extension search box to get started. Here’s what it looks like before and after.My favorite site for getting information on files is FileInfo because it has a huge database plus its got a very clean and well-organized site. See Microsoft’s article here for more info. We do this by setting the RemoteDomain property TNEFEnabled to false on the Default policy. In order to resolve it, we need to force Exchange Online to convert rich text messages to HTML before sending them. The problem is, a lot of email programs can’t open emails sent using this method, known as Transport Neutral Encapsulation Format – or TNEF. This attachment contains all the rich text formatting, elements and other data unique to rich text messages. When you send an email from Outlook using rich text, a plain text copy of the email is sent, along with an attachment called WINMAIL.DAT. This issue occurs when the receiver’s email client is unable to interpret a message sent from Microsoft Outlook in the Rich Text format. Set-RemoteDomain Default -TNEFEnabled $false

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How to fix the Office 365 WINMAIL.DAT attachment issue Are people receiving emails from your Office 365 users that are blank with an attachment called WINMAIL.DAT? It’s probably time to disable TNEF across your Office 365 organisation.

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