How can I extract a .zipx file using Matlab

Is it possible to unzip .zipx files in matlab?

I receive the following error: ??? Error using ==> unzip at 70 Invalid zip file

Answer 1

[Walter Roberson]

Looking at http://kb.winzip.com/kb/entry/7/ I see that the .zipx compression methods include: BZip LZMA PPMd Jpeg and Wavpack. I would be surprised if MATLAB's unzip can handle any of those other than perhaps BZip.