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@Yasser, Alain Trostel
I have the same problem (I did have the .dll file in the same folder as my .m file, but ??? Undefined function or method 'windowMaximize' for input arguments of type 'char'. )
I think it may be because I'm using WinXP64 bit with Matlab 64bit version. Probably the dll is not compatible with that...
I hope someone will make a 64bit version available and post it here.