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Not applicable

Each user would have to set each browser individually.

Note: I don't think it's possible to set the default PDF viewer with code for every user who visits the site.

See the following link to enable Adobe Reader as the default PDF viewer in different browsers:

http://helpx.adobe.com/acrobat/using/display-pdf-browser-acrobat-xi.html

Note: Not all PDF viewer browser plug-ins support PDF submissions, and most 3rd party viewers may not support forms created with LiveCycle or forms with Extended Reader Rights enabled.