In APPX 4.2.2, the APPX session tells the O/S to "Print" the PDF print file. For this to work, Acrobat Reader must be installed on the server and there must be an action defined for the "Print" action for "pdf" files. Open Windows Explorer and navigate to Tools-->Folder Options-->File Types. Scroll down and select the extension for "pdf". If there isn't one, the easiest way to get one is to uninstall Acrobat Viewer and reinstall a fresh copy of Acrobat Viewer. If you find an entry for "pdf", click on the Advanced button. In the Actions box, there should be an entry for "Print". This entry defines the command that should be run when an application issues a request to Print a pdf document. If there is no Print entry, then you should reinstall Acrobat Viewer to correct the problem.
The printed output will always go to the server's current default printer regardless of what printer you may have specified within APPX. This is a limitation of the current release of APPX and will be addressed in a future release. Make sure that your server has a default printer defined.
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