Adding application to "Open With" context menu - QNapi problem
I got QNapi to show up in the open with menu by changing 

&lt;key&gt;CFBundleTypeRole&lt;/key&gt;
&lt;string&gt;None&lt;/string&gt;


to

&lt;key&gt;CFBundleTypeRole&lt;/key&gt;
&lt;string&gt;Viewer&lt;/string&gt;


and then running /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -f /Applications/QNapi.app and quitting and reopening Finder.

(lsregister -f forces a file to be registered even if its modification date has not changed.)