How to disable adobe reader in safari

Question

I am aware there is this thread on basically the same problem How can I regain Preview as my default PDF browser in Safari?.
However my circumstances are a bit different.
One of my content vendors uses FileOpen to lock their PDFs and that is why I even bothered to install adobe (v10.1.4). Thru the install process I was careful not to have adobe become the default viewer by checking all the relevant boxes I saw.
When I go to Finder and doubleclick on a PDF, they are still opened by Preview. Right click->Get Info does show Preview as default viewer.
However in Safari, Adobe has taken over despite in Adobe->Preferences->display pdf in browser is not only unchecked but grayed out. But even though grayed out, right below that checkbox shows Adobe Reader.app is the browser view and I see no way of changing it.
In Library/Internet Plug-ins there are NO pdf plug ins. In fact I have only a single one (picasa).
I am not aware how to get to Username/Library/Internet Plug-ins as the reference thread talks about.
Whatever the solution, I still need adobe working on my machine otherwise I cannot view the content from that one vendor.
Any suggestions? Thanks.
Message was edited by: quatrieme to clarify Adobe->Preferences settings

Answer 1

thanks, Linc. interesting suggestion. It shows the following unfortunately. The background: I initially installed adobe reader 11.0.01 but discovered the production version of FileOpen does not work with it. So I uninstalled it and installed 10.1.4 instead. But looks like some parts of it lingers.
Adobe Acrobat NPAPI Plug-in, Version 11.0.01
Adobe® Acrobat® Plug-in for Web Browsers, Version 11.0.01 — from file “AdobePDFViewerNPAPI.plugin”.
application/pdf
Acrobat Portable Document Format
pdf
application/vnd.adobe.pdf
Acrobat Portable Document Format (Interim)
pdf
application/vnd.adobe.pdfxml
Acrobat XML Portable Document Format
pdfxml
application/vnd.adobe.x-mars
Acrobat XML Portable Document Format (Interim)
mars
application/vnd.adobe.xdp+xml
XML Data Package
xdp
application/vnd.adobe.xfd+xml
FormFlow99 Data File
xfd
application/vnd.adobe.xfdf
Acrobat Forms Data Format in XML
xfdf
application/vnd.fdf
Acrobat Forms Data Format
fdf