>If I pass 'c:\test\*.*', 'c:\test\ggg.zip', it works.
>If I pass 'c:\My Documents\*.*', 'c:\My Documents\ggg.zip', it failes.
>

You may need to further quote encapsulate LFNs that contain a space - try using
'"c:\My Documents\*.*"', '"c:\My Documents\ggg.zip"'