I was confused by your answer regarding winmail.dat. The file cannot be opened traditionally, at least to obtain what the receiver believes to be valuable contents. Rather, it's used internally by ...

Q: Most of my e-mails from work come with winmail attachments. I have tried to open these files through multiple different programs, without success, on iPhone iPad, and my PC. How can I open ...

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. They are ...

Letter Opener is a Mail.app plugin which decodes the .dat files inline, so the process is transparent to you, the recipient. The attachments appear like any others, and life is that much easier.

That could be harmful to the computer and the operating system. Q: I have received an email with an attachment called winmail.dat that I am unable to open. Can you tell me how to access this file?

If you regularly receive winmail.dat files from business associates, Letter Opener is well worth the investment.

We keep getting e-mail attachments in winmail.dat files, and can't open them. What's going on? Is there a utility that can extract the attachments from these?