On occasion you may receive a strange attachment in your email called Winmail.dat. When you try to open it Windows will not let you, and the person sending it to you has no idea what it is.

Here’s how it works. What is the deal with those winmail.dat files? I get them in my email all the time, and nothing seems to be able to open them. Winmail.dat is a proprietary email file format ...

When you send an email message from a Microsoft Outlook client that is configured incorrectly, the receiver may receive an attachment with the name winmail.dat. This is a binary attachment that ...

A file that contains RTF format codes in order to support rich text in email messages. WINMAIL.DAT is a UUencoded file that is sent from a Microsoft Outlook or Exchange email client. If the ...

Q. I sometimes receive e-mail messages with a “winmail.dat” file attached that I cannot open. Why does this happen, and what can I do to fix it? A. The winmail.dat file usually appears because ...

Letter Opener converts winmail.dat attachments on the fly, so you can actually see and use the attachments the sender intended you to have. [Editor’s note: The following review is part of ...

Q. I received e-mail from a relative that says it is in a winmail.dat file. When I try to open the file, I get a message that says something like: "You are attempting to open a dat file.

If you've ever received a forward from an Outlook user in Mail.app containing an attached winmail.dat file, you probably scratched your head wondering why this strange file ended up in your inbox ...

See this Microsoft document for more details. It is titled: 'Winmail.dat attachments included in received messages with Outlook.' It applies to Microsoft Outlook 2000. If that doesn't work ...

Is anyone else receiving winmail.dat attachments, instead of the real attachment since migrating to Exchange 2010? I've had MS give me 4 different kb's on it and none have resolve the issue thus far.

Many times when receiving mail attachments with the new Exchange-enabled Microsoft Entourage v.X from Windows users, you will get a winmail.dat file that is inaccessible under Mac OS X.