Bug in 14.9: unable to open .hdr radiance files
Starting with version 14.9, Premiere fails to open any .hdr file with error message: "File format not supported". AE has a similar new bug, with a more verbose error message related to the Radiance.8B import plug-in.
This bug is not present in previous versions. When persisting with version 14.9, one workaround is to use Photoshop to convert the HDR file to an EXR, which does work properly.