OPEN? Please

‘OPEN’ does not work with regard to an attachment, OPEN goes straight to ‘save as’ Which works ok. OPEN worked fine on an earlier version of T Bird.
Help please.
ALAN

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You might find the links here useful:
https://support.mozilla.org/en-US/kb/configuration-options-attachments

If not ask here:
https://support.mozilla.org/en-US/products/thunderbird