I have a problem with a VMware image of High Sierra that could not open the volume marked for start-up. That volume was greyed out in DiskUtil. Someone on Superuser.com successfully extracted a volume from the virtual machine with 7zip and using your HSFexplorer managed to recover all the contents from an HSFX file. I've gone the same way, but using Ctrl+O on my hfsx file gave me a "couldn't open 3.hsfx file" message. Am I doing something wrong? Thanks for any help you can give me. Guy