Try a right click, select Save As.

Is the plugin that is used to handle this file type still enabled?

You can check that on the "Firefox/Tools > Add-ons > Plugins" page.

See also Tools > Options > Applications

• https://support.mozilla.org/kb/change-firefox-behavior-when-open-file
• http://kb.mozillazine.org/File_types_and_download_actions

Thanks for responding Fred.

Yes, Save As works fine and I am sure our web site users could do that but the data will be known to them and they will have the application installed on their PC. So with that in mind we would like to open the appliction or at least get to the Open/Save dialog.

With what content type does the server send the file?

• Tools > Page Info > General

If Firefox displays the file in a tab then it is likely that the server sends the file as text/plain.

• https://developer.mozilla.org/Properly_Configuring_Server_MIME_Types
• https://developer.mozilla.org/How_Mozilla_determines_MIME_Types

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.

Perfect cor-el

I put the .htaccess into the directory and all works again.

Many thanks guys for the fast, efficient help.

John