How to give a profile a default mimetypes.rdf file?

Hello,
I'm deploying Mozilla Firefox 31ESR on thousands of computers. I'm looking for a way to pre-configure how firefox handle the mimetypes. For instance, to open pdf with Adobe Acrobat Reader.
To achieve this, I put a mimetypes.rdf file in "C:\Program Files (x86)\Mozilla Firefox\browser\defaults\profile".
When the profile is created, this file is copied, then modified.
The lines:
<RDF:Description RDF:about="urn:mimetype:handler:application/pdf"
NC:useSystemDefault="true"
NC:alwaysAsk="false" />
Becomes:
<RDF:Description RDF:about="urn:mimetype:handler:application/pdf"
NC:handleInternal="true"
NC:alwaysAsk="false" />
-If I replace manually the file "mimeTypes.rdf" in the newly created profile, it works perfectly.
It seems to be the same problem as: https://support.mozilla.org/fr/questions/1015378
Why is the mimetypes.rdf file modified? How can I set a mimetype policy?
Thanks a lot!

It works for me with both the user.js file and your mimeTypes.rdf file.
<pre><nowiki>user_pref("pdfjs.disabled", true);
user_pref("plugin.state.nppdf", 2);
</nowiki></pre>
<pre><nowiki><?xml version="1.0"?>
<RDF:RDF xmlns:NC="http://home.netscape.com/NC-rdf#"
xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<RDF:Description RDF:about="urn:mimetype:handler:application/pdf"
NC:alwaysAsk="true"
NC:saveToDisk="true">
<NC:externalApplication RDF:resource="urn:mimetype:externalApplication:application/pdf"/>
</RDF:Description>
</RDF:RDF>
</nowiki></pre>

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