Thanks for the reply, and sorry, I didn't realise that HD Photo was a native format
But I actually ended up messing with the registry in the end and managed to enable thumbnail creation and image details for both .hdp and .jxr by cloning the settings from the .wdp registry keys, took about ten registry changes for both. There's actually just one extension that comes to mind that I'd like to see added, for now at least, it's *.jpf for JPEG2000, as it seems to be the default extension for JPEG2000 when saving with Photoshop. Hope to see WebP format added some time in the future. Cheers!