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10/18/25
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Comment on [#12882] ActiveSync does not show attachments in TNEF container (winmail.dat)
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> Hi, > > when one receives a message from an Outlook user in rich-text-format > (RTF), all attachments are stored in a "winmail.dat" TNEF container. > > IMP automatically decodes this container and shows the contained > files while hiding the original winmail.dat attachment. > > ActiveSync hides the winmail.dat file completely and does not show > any attachment. > Attached you'll find an example message with a winmail.dat file. > > We should either a) use the same decoder as IMP and show the > attachments or b) show the winmail.dat file to the user. > > In my particular case the user complained he can't see the > winmail.dat file. Back when using Exchange+ActiveSync, he was able to > open winmail.dat files using an app on his iOS device. > > Cheers, > Thomas >
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