The Photoshop plugin for Mac OS X to save and open MBF files is now available. It requires at least Photoshop CS3/Elements 6. On Photoshop CS3 however, blending modes and layer visibility flag is not restored while opening (but is saved correctly). On Photoshop CS4 it Just Works™.

The source code will soon be available. We did not develop a Windows version, but the code should be cross platform so anybody with experience with VC++ and some spare time can help.