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class SHELLEXECUTEEX
{
            public UInt32 cbSize;
            public UInt32 fMask;
            public IntPtr hwnd;
            public IntPtr lpVerb;
            public IntPtr lpFile;
            public IntPtr lpParameters;

            [MarshalAs(UnmanagedType.LPTStr)]
            public string lpDirectory;

            public int nShow;
            public IntPtr hInstApp;

            public IntPtr lpIDList;
            public IntPtr lpClass;
            public IntPtr hkeyClass;
            public UInt32 dwHotKey;
            public IntPtr hIcon;
            public IntPtr hProcess;
}            

string docname = GetCurrentDirectory() + @"update.cab";
int nSize = docname.Length * 2 + 2;
IntPtr pData = LocalAlloc(0x40, nSize);
Marshal.Copy(Encoding.Unicode.GetBytes(docname), 0, pData, nSize - 2);
SHELLEXECUTEEX see = new SHELLEXECUTEEX();

see.cbSize = 60;
see.dwHotKey = 0;
see.fMask = 0;
see.hIcon = IntPtr.Zero;
see.hInstApp = IntPtr.Zero;
see.hProcess = IntPtr.Zero; ;
see.lpClass = IntPtr.Zero;
String dir = @"\Program Files" + @"\" + "mobileProg"+@"\";
see.lpDirectory = dir;
see.lpIDList = IntPtr.Zero;
see.lpParameters = IntPtr.Zero;
see.lpVerb = IntPtr.Zero;
see.nShow = 0;
see.lpFile = pData;

            try
            {
                ShellExecuteEx(see);
            }
            catch (Exception ex)
            {

            }

            LocalFree(pData);