I have noticed one issue with using the registry change after Kindle for PC launches to prevent KFX downloads. If I had made a purchase since I last ran Kindle for PC, it would start the download immediately after it finished starting up and would download the KFX before noticing the registry change. Going to Manage Your Content and Devices where I changed my default device to my iPhone keeps that from happening. If it does happen, "remove from the device" and then restarting Kindle for PC allowed manually downloading an AZW3 copy. Jhowell's modified file has a shorter wait time but still showed the issue.
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