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I cannot change the program used to open PDF attachments in the options

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daniel341
daniel341
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Thunderbird 60.3.0 (64bit). Windows 7. I know it's an old version, but it has to stay that way. The program does not open PDF attachments. When I click on the attachment, nothing happens. It can only be saved to disk. I cannot change the program used to open PDF attachments in the options. I am attaching a photo.

Thunderbird 60.3.0 (64bit). Windows 7. I know it's an old version, but it has to stay that way. The program does not open PDF attachments. When I click on the attachment, nothing happens. It can only be saved to disk. I cannot change the program used to open PDF attachments in the options. I am attaching a photo.
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