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Can't open a pdf file attachement to e-mail

Time:October 11
I canot open an e-mail pdf file attachment..I get a message
You have chosen to open Invoice---pdf
which is: Firefox HTML Document (479kB)
What should Thunderbird do with this file?
Open with Firefox (default)
I do all of the above but nothing happens and I keep getting the same message over andf over again??
Please advise what I should do
Thanks. I disabled Protected Mode, and I was able to open the pdf attachment. Just to make sure, I enabled it and then disabled it again, and when I tried to open the attachment, it did as before – Adobe Reader (Not Responding) and Internal Error message. Tried it several more times, (enable and then disable Protected Mode) and each time, Adobe Reader wouldn’t launch (Not Responding, Internal Error).
Morris Davidson