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Attachments turn into *.dat

A user raised a ticket to JIRA Service Desk with an email attachment, which is an excel file.

When it is viewed in the portal, the attachment turns into a dat file, which is not readable.

1 answer

1 vote
Andy Heinzer Atlassian Team Jul 22, 2019


I see that you have found Service Desk is storing these attachments into a .dat file.  Perhaps these have a filename such as winmail.dat

My colleague @Angélica Luz created a helpful article about this problem in

Essentially, this happens because the sender is using a Microsoft mail client, like outlook.  There are specific settings within that sender's email client that would have to be adjusted to prevent this.  Jira does not have a means to change this, it is only storing the attached file in the manner it sees it.  You could follow the steps in a guide such as to have that client stop sending those kinds of .dat attachments.

I hope this helps.


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