If I drag an attachment out of Thunderbird onto the desktop and then double click it, it always opens in HexEdit which is almost certainly not what I want. I have to use right click -> open with on them.
If I can't make it open with the expected application can I at least change it to Preview which is likely to be right more often.
This affects all file types. XLS, PDF, JPG, ZIP, whatever.
Also, it's only Thunderbird. Downloading in Firefox or Safari or FTP or whatever produces files that open in the correct app when double clicked.
I had the computer affected stolen :( and can't reproduce the problem on my replacement. I guess I'll have to chalk this one up to a bug in Thunderbird that has probably been fixed.