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Can't open an attachment sent to me via an email. This has only just become a problem. The attachment is a PDF ending in doc.x and it

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I have been using Thunderbird email now for a few months. I have not had any problems opening and sending attachments in emails until last week. I am trying to open a PDF attachment ending in docx. However, when I try to open it, it was asking me to SAVE it but only giving me the option to save it in 'All Files'??? Why is it doing this? Now, I can't even open the attachment at all. What is going on? It is saying it is not a supported file document or it has been damaged. How can this be fixed please.

I have been using Thunderbird email now for a few months. I have not had any problems opening and sending attachments in emails until last week. I am trying to open a PDF attachment ending in docx. However, when I try to open it, it was asking me to SAVE it but only giving me the option to save it in 'All Files'??? Why is it doing this? Now, I can't even open the attachment at all. What is going on? It is saying it is not a supported file document or it has been damaged. How can this be fixed please.

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If it ends with docx then how do you know it's a pdf?

Thunderbird cannot open either pdf or docx (MS Word) files itself, so you are obliged to pass these on to an application that can. The usual way is to save them to disk and then invoke the appropriate application.

"All files" is just, AFAIK, a neutral filter. It's common for a file save dialogue to apply a mask so that you see only other files of the same type as the one you're saving. "All files" effectively removes any such filtering, so it is not a location as such. A "Save as" dialogue normally lets you browse to a location of your choice.