How can I run .mexw32 extension on matlab?

I m new to the matlab of using mex files. I have got code from someone for my work.When I run the file using that function name, It works well. but I cant view that file.Can anyone please say what is the problem in it to open this mexw32 file?? when I execute Package mex It gives the following error.

mex

 Usage: 
        MEX [option1 ... optionN] sourcefile1 [... sourcefileN] 
            [objectfile1 ... objectfileN] [libraryfile1 ... libraryfileN] 

      or (to build an Ada S-function): 
        MEX [-v] [-g] -ada <sfcn>.ads 

    Use the -help option for more information, or consult the MATLAB API Guide. 

C:\PROGRA~1\MATLAB\R2008B\BIN\MEX.PL: Error: No file names given.

??? Error using ==> mex at 213 Unable to complete successfully.

Answer 1

[Jan]

The error message is clear: The mex command requires more arguments, e.g. the name of the source file, which should be compiled. As usual reading the documentation would explain this immediately:

doc mex

Mex files are compiled C/C++/etc. files and your observation is correct: You cannot open or read them, because they are compiled.