in the ImageEN-helpfile I found that x3f-files are supported:
If I'm using your CameraRAW-Demo and I try to load a x3f-file then I get the message:
The files are from all_raws_rawsamples_ch.7z and can be displayed by the FastStone Image Viewer - also these files are not corrupted. The same is if I want to display a thumbnail of these files in an ImageEnFolderMView. The ImageEn-Version is 10.0.2.0.