problem of large design with Qsys

ok I tried to find a solution to configure the JVM.

the switch to expand java heap size memory is -Xmx2048m where 2048 is the size of maximum heap memory I want to allocate.

The issue is where can I use this switch?

In some examples I saw this switch is used like a parameter of the application.

The application that I want to expand heap size memory is ip-generate.

So I tried with a command-line like that:

ip-generate -Xmx2048m --project-directory=D:/myproject --output-directory=D:/myproject/synthesis/ --file-set=QUARTUS_SYNTH --report-file=sopcinfo:D:/myproject/system.sopcinfo --report-file=qip:D:/myproject/synthesis/system.qip --system-info=DEVICE_FAMILY="Stratix IV" --component-file=D:/myproject/system.qsys

But it makes an error:

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Error: Unrecognized switch Xmx2048m

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I forgot to specity that I'm working on windowsXP-64bit and so I use NiosII 11.1 command shell to launch this command-line.

Thanks for your responce.