Removing all the settings for attachment-handling actions
If Thunderbird doesn't seem to be performing attachment-handling actions as it should, or if certain options are grayed out (not selectable) when they shouldn't be, and you can't resolve the issue as described above, it could be due to a corrupted "mimeTypes.rdf
" file. Thunderbird uses this file to store your file-handling preferences for specified file types. Deleting it sometimes cures the problem. To do so:
- Exit Thunderbird if it is running.
- Recommended: make a temporary backup of your Thunderbird profile (or at least of the mimeTypes.rdf file).
- Delete mimeTypes.rdf from your Thunderbird profile folder.
- Restart Thunderbird to see if the problem has been fixed.