Hello Peter Woods,
Unfortunately, Microsoft’s policy states that digital apps are non-refundable unless the specific offer or applicable law provides an exception. Since DTS Headphone:X is a digital in-app purchase, a change of mind or the app not meeting your needs would not normally qualify.
You can still give it a try by going to your Microsoft account order history, locate the DTS Headphone:X purchase, and select Request a refund or Return information if that option appears. If no refund option appears, the purchase is likely not eligible under the standard policy.
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