Thunderbird and attachments -- save but not open

[Steven Stern]

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Thunderbird seems to have lost the ability to open attached files (.pdf,
for example).  The only option on a double click is to save the file.
Per the troubleshooting guide, I tried removing MimeTypes.rdf, but that
didn't help. There is no "open with" option at all.

Under EDIT -> PREFERENCES -> ATTACHMENTS, there is no way to add a new
type or change any actions.

Is this a problem with my installation or something more general?
- -- 

  Steve
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