Cannot open application associated with unknown filetype

I am trying to download or open a file type of .psdata for which I have an application installed however when I click the link FF simply opens the file which of course displays a page of binary data.
FF used to open this file correctly but now it does not.
Thanks

Thanks cor-el
The application isn't installed as a plugin, it is a program on the PC.
This works fine in IE and used to work with previous versions of FF. The file type is recognized and the option to save or open the program is given.
As I say, at the moment all I am getting is a browser page of binary data instead of the Save or Open option.
'''''With what content type does the server send the file? '''''
'''''If Firefox displays the file in a tab then it is likely that the server sends the file as text/plain.'''''
Yes it does.

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