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Cannot choose specific destination folder.

Это отзыв для предыдущей версии этого дополнения (1.4.3). 

Versions of Extract 'Em! prior to 1.5.1 deferred to the Thunderbird settings for FIle and Attachment handling (always prompt or use a specified directory); I suspect that your setting was for the latter. With 1.5.1, an Extract 'Em! option has been added allowing you to select whether you want to be prompted to select a directory, or always use the one indicated by the respective Thunderbird setting.