How does firefox create the default mimetypes.rdf file?

Hi, I am trying to update the default mimetypes.rdf file to add a list of new file types and the associated program to launch with but am struggling to find where/how the default mimetypes.rdf file is created.
The Omni.ja file within 'C:\Program Files\Mozilla Firefox' has a version of the file but it is blank, what populates this file?
I have tried replacing this file with the version we need to use, delete the Mozilla directory from my local profile and re-launch Firefox, but the newly generated mimetypes.rdf file is still the old version.
I am using Firefox version 10.0.6

Hi,
I am in the same situation than you but I forced firefox to take my own file if I remove it from my profile.
What i did:
1 Create my own custom mimetypes.rdf file. Firefox Interface - Options - Options - Applications...
2 Copy mimetypes.rdf in C:\Program Files (x86)\Mozilla Firefox\browser\Defaults\profile
So, if I remove the mimetypes.rdf file from my profile it takes from default location fine. However deleting the profile, opening firefox again it doesn´t use my own mymtypes.rdf file in the new profile, insteant it creates the "default installation" one.
On the other hand, I tried to set pdfjs.disabled = true from about:config, however although it sets the default PDF app "Adobe Acrobat", it doesn´t work. It doesn´t open any pdf file.
I am thinking to create an advertised shortcut in order to replace the mimetype.rdf when the user starts firefox (I distribute the firefox settings in a MSI) depending of the date of the file but it will take a few seconds each time the user run firefox. I really don´t like it...
Sorry for don´t help too much...
If anyone could post how firefox create mimetypes.rdf in new profiles...

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

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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" />
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-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
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How does firefox create the default mimetypes.rdf file?

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