I’ve added tentative support for .iso files such as those produced when ripping your SACD’s using a playstation. This will almost certainly only work with players that understand how to digest a DSD ISO image, such as JRiver Media Center or foobar with the appropriate extensions.
The new version can be downloaded here: FWLSetup_v1.31
Also, the good folks who provide SoX have released 14.4.1a – this now includes FLAC support and has been tested with this version of FWL, I had no problems. The new release can be found on their sourceforge page. I suggest the file “sox-14.4.1a-win32.exe”, that is the self installing Windows binary. It’s absolutely not necessary to get the latest version but generally a good idea so you benefit from bug fixes.