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I've attached a JPG from my 'My Pictures' folder to an e-mail (sic. in Thunderbird?), but it will not open before sending, nor after.

Message -

C:\Users\XXXXX\App data\local\temp\xxxxx.jpg cannot be opened because the associated helper application does not exist.

What do I change where?

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This sounds like a bug with Thunderbird I would report it to through the proper channels. – Ramhound Jan 8 '13 at 21:13

If I recall you get the option from that point of choosing which program should be used to open the file. So select one and use it.

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