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Intune: Third-Party ADMX & OMA-URI - Step-by-Step (Part 1)

ADMX Ingestion

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Hey! Welcome to Part 1 of a multipart series on Intune device management, specifically: Third-Party ADMX & OMA-URI.

In part 1, we will look at "ingesting", or deploying, a third party ADMX.

There are a lot of posts on the internet that discuss Intune policy, the required OMA-URI format, and Value strings. For common settings, it’s good enough to just copy and paste the settings offered by the posts. However, what if you wanted to work with settings that you couldn’t easily find online? In this multipart series, we will take a deep-dive into working with third-party ADMX files, and constructing the OMA-URI settings from scratch for deployment through Intune.

In this blog example we work primarily with Google Chrome ADMX because Chrome is a commonly used application that administrators wish to manage. If you wish to follow along, you can download the latest Google Chrome Enterprise package, which will include the ADMX templates we will be referring to.

Background Information

Before we get started, some background information will help your overall understanding of this whole process.

What is OMA-URI?

OMA-URI stands for Open Mobile Alliance Uniform Resource Identifier. Open Mobile Alliance attempts to provide an open standard for mobile device management. Information is processed through a language called SyncML which provides the formatting we will need to know in order to process the OMA-URI settings that Intune MDM relies on.

With that out of the way, let’s work on setting our first policy.

Ingest the ADMX

Before you can set any policies on the target machine, you will need to deploy the ADMX templates. In traditional on-premise environments, this was as easy as uploading the ADMX file into the Central Policy Store and accessing the new settings via Administrative Templates.

For Intune, this process is called “ingestion”. The ADMX template will be sent via SyncML through the Policy Configuration Service Provider (CSP) URI. This URI comes in a standard format based on the OMA standard.

For device wide configuration, the Device/ portion may be omitted from the path, deeming the following paths respectively equivalent:

  • ./Vendor/MSFT/Policy/Config/AreaName/PolicyName

  • ./Device/Vendor/MSFT/Policy/Config/AreaName/PolicyName

OMA-URI Path Structure
OMA-URI Path Structure

Using the documentation provided by Microsoft on CSP, we can see that to install an ADMX we will want to build the URI like this:


If we refer back to the Microsoft CSP documentation, we will see the UniqueID element specifies the unique ID of the app ADMX file that contains the policy to import. This is usually the name of the ADMX file. So, putting this all together, to ingest our Chrome ADMX, our OMA-URI will look like this


For the Value field, we simply paste in the entire content of the ADMX file as the documentation indicates. Open the ADMX file in Notepad and copy/paste the whole thing into the Value field.

Notepad showing chrome.admx file
Chrome.admx Template Example

Push this policy down to your test machines by deploying this Intune custom policy to make sure this step successfully completes.

While you can move directly to Part 2 before applying the test policy, doing this first will be helpful as you build the OMA-URI. Trust us.

In Part 2 we will go over how to construct OMA-URI paths from scratch. Be sure to follow us on LinkedIn to make sure you don't miss Part 2 of this multipart series when it releases! If you've enjoyed this post, please Like or Share so others can also benefit.

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