Check the box "Do this automatically for files like this from now on". (Do not forward an email whose attachment caused the box to be disabled.) Then open the attachment and choose how you want Thunderbird to open it. If that doesn't help, send yourself an e-mail to which you manually attached a file with this file name extension. Instead, change it to specify the actual application. To work around this, ensure that Thunderbird's attachment-handling action for the file name extension is not the system default application. Therefore the box "Do this automatically for files like this from now on" is disabled. These content types can apply to various different types of file. Some mail programs send attachments with a nonspecific content type: application/octet-stream or application/x-msdownload. "Do this automatically." checkbox disabled You might have to save the file so that you can open it in the way you want. If the content type does not match the file name extension, then Thunderbird might not handle the file in the way you expect. If the content type is unhelpful, then Thunderbird uses the file name extension to decide what to do with the file. Thunderbird uses the content type to decide what to do with the file. Note that there might be many Content-Type headers in the message, so you must be careful to find the one that applies to the attachment you are investigating. Find the Content-Type header that names the attachment. From the menu bar choose View -> Message Source. To check the content type of an attachment, select the e-mail in a folder but do not open the e-mail. This can make Thunderbird handle an attachment in an unexpected way when you try to open it. Some mail programs send attachments with the wrong content type. Unexpected handling of certain attachments It can be very useful if you get a bad setting due to opening an attachment that has the wrong MIME type definition, acknowledged "do this from now on for all attachments of that type" and it replaced the good entry with a bad entry. The MIME Edit extension adds a Tools -> MIME Edit -> Edit menu command that does everything (except for searching) that the download actions window does, plus it lets you create a entry. Open the attachment and choose how you want Thunderbird to open it. To add a download action to this list, open an e-mail that has an attachment of the type you want to add, or write a new e-mail and attach a file of the type that you want to add. For instance, if you previously used the "Do this automatically for files like this from now on" checkbox to have Thunderbird always open ".doc" attachments with Word, you can undo that file-handling association by clicking on the "DOC" file type and clicking the "Remove Action" button. Changing these settings will not allow save/open actions to be performed automatically for attachments in incoming messages without user intervention. Despite what the labelling in this panel might suggest (it says "Thunderbird can automatically save or open attachments of certain types"), these settings simply allow you to change the save/open actions that will be performed when you double-click on an attachment of a specified file type.
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