https://github.com/MainMemory/FW-KENSC-ShellExt/releases/tag/v1.1.1 Here's a minor update. The tool's been brought up to date with upstream FW-KENSC, fixing Moduled Kosinski+ support in the process. I've also disabled a few of the more exotic formats (Moduled Nemesis/Saxman/Enigma) since they were unstable.
https://github.com/MainMemory/FW-KENSC-ShellExt/releases/tag/v1.2 Kosinski+ has been updated to its newer format. This improves decompression time (on the Mega Drive, that is).
Just tried this, tried to uncompress all the nemesis art in sonic 1 and all I got was a bunch unc files most of which were 0bytes in size everything else was around 1kb in size and there were only like 4 files that weren't 0 bytes Edit: Found v1.2.1 under the releases, worked fine.