Lightroom Classic: No x3f support

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Bought a Sigma DP2 Merrill, which creates raw files as "X3F." According to this guide, they should be supported: https://helpx.adobe.com/camera-raw/kb/camera-raw-plug-supported-cameras.html

I'm unable to import the files into any Adobe program so far, tried with latest Lightroom Classic, Lightroom CC, and Lightroom web. All of them give an "Error - Unsupported File Type" on import.

In this thread, it looks like other users are also facing a similar problem: https://community.adobe.com/t5/lightroom-classic/how-to-import-x3f-file-into-lightroom/m-p/11099769?page=2

You can download a sample file here: https://drive.google.com/file/d/1jkP4ePEz4mEt1qt7bQckacalsgRh44vs/view?usp=sharing . It works with Sigma's app (Sigma Photo Pro), so it is not corrupt, but can't be used by Adobe.
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