Mozilla Monitor website will be down for 2 hours starting 5/20/2025 at 6 AM PT. Visit our status site for updates.

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Open a .MHT attachment in Internet Explorer instead of Thunderbird.

When I get an attachment with a .MHT extension, Thunderbird automatically tries to open it. I checked the Options/Attachments/Incoming but it does not list .MHT and I see no way of adding it?

If I save it to my hard drive and open it with Internet Explorer it opens without issue.

When I get an attachment with a .MHT extension, Thunderbird automatically tries to open it. I checked the Options/Attachments/Incoming but it does not list .MHT and I see no way of adding it? If I save it to my hard drive and open it with Internet Explorer it opens without issue.

Chosen solution

dconner01 said

When I get an attachment with a .MHT extension, Thunderbird automatically tries to open it. I checked the Options/Attachments/Incoming but it does not list .MHT and I see no way of adding it? If I save it to my hard drive and open it with Internet Explorer it opens without issue.

This addon might be helpful:

Thanks

Read this answer in context 👍 1

All Replies (1)

Chosen Solution

dconner01 said

When I get an attachment with a .MHT extension, Thunderbird automatically tries to open it. I checked the Options/Attachments/Incoming but it does not list .MHT and I see no way of adding it? If I save it to my hard drive and open it with Internet Explorer it opens without issue.

This addon might be helpful:

Thanks