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It works! But didn't opens files with spaces in file names (Ubuntu 22.04 // Thunderbird 115.9.0 64 bit // LookOut 6.2).
Here stderr output when trying to open a file with spaces in a file name:
console.error: "AttachmentInfo.open: file - file:///tmp/\u0421 \u043D \u043E \u0410 \u2116 4-012 \u043E\u0442 19 \u0430 2024 \u0433.pdf, [Exception... \"Component returned failure code: 0x80520012 (NS_ERROR_FILE_NOT_FOUND) [nsIMIMEInfo.launchWithFile]\" nsresult: \"0x80520012 (NS_ERROR_FILE_NOT_FOUND)\" location: \"JS frame :: resource:///modules/AttachmentInfo.sys.mjs :: _openFile :: line 425\" data: no]"

There is workaround:
1) Open mail in thunderbird.
2) Open /tmp in file manager. Here you can open attached files or copy it to other location (e.g. ~/Downloads).

Questa recensione riguarda una versione precedente (6.2) del componente aggiuntivo.