When using Thunderbird on Windows 8 with Office 2013 I get an error trying to open csv files.
If I save the attachment to the desktop, etc I can then open it fine with Excel. From within Thunderbird the attachment looks like it wants to open in Excel but I get an error message
We're sorry, but Excel has run into an error that is preventing it from working correctly. Would you like to repair.
Repairing does nothing.
DDE is disabled already.