User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; hu; rv:1.8.1) Gecko/20061010 Firefox/2.0 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; hu; rv:1.8.1) Gecko/20061010 Firefox/2.0 version 2 beta 1 (20061116): Many times the msg window is working good. I can open the attachments. But sometimes it cannot open them. Only can save them into hdd. Why ? The extension is same that I saw in yesterday (wmv, mp3, pps, ppt). Reproducible: Sometimes Steps to Reproduce: 1. Message arrived. 2. Try to open attachment. 3. It can only saveable, but not openable.

I don't know that's working in another context or not.

There has been a change in the software in the way it handles message attachments of type application/octet-stream. I don't know if this will be further changed in time for the TB 2.0 release; the change was originally implemented on the Firefox side. Incidentally: the attachments you provided to this bug are not decodable. *** This bug has been marked as a duplicate of 346332 ***