Why is Excel being opened in Outlook?

I emailed an Excel file to a colleague. It was sent as an attachment in
Thunderbird. The recipient - who uses Outlook - saved the spreadsheet to disk.
Now if she tries to launch the file (either from Explorer or from within Excel
itself), it actually opens up inside Outlook and starts to create an email
message. This only occurs if Outlook is already active. It also only occurs with
some of the spreadsheets that I sent her.

Ideas?

You sure your colleague isn't just seeing the "envelop".

File|send to|and see if "mail recipient" is depressed.



JW wrote:
>
> I emailed an Excel file to a colleague. It was sent as an attachment in
> Thunderbird. The recipient - who uses Outlook - saved the spreadsheet to disk.
> Now if she tries to launch the file (either from Explorer or from within Excel
> itself), it actually opens up inside Outlook and starts to create an email
> message. This only occurs if Outlook is already active. It also only occurs with
> some of the spreadsheets that I sent her.
>
> Ideas?

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Dave Peterson