We use the same system as the arduino ide so whatever solution you find on the web or on arduino.cc/forum will also work for vm.

if you find you need extra functionality on top of that then feel free to provide detail.

Thanks. I think you are using the stk500 programmer.

You could try re-defining the extra_params in a local board.txt. The "vMicro>Add Code" menu will create one for you. Add the following and then click save. Then try.

I can't recall which of the following should work but try them together can't do any harm. Notice we add the serial port because that is what the default programmer def does, then you can add the requested -D

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If that doesn't work then you need to find which programmers.txt contains the definition of the "Atmel STK500 development board" programmer. The definition will probably be in a package somewhere below C:\Users\james\AppData\Local\arduino15\packages\

The links in the small preview at the bottom of Board manager show paths to packages if you can find it.

Editing the core platform.txt / programmers.txt files will be the quickest way to try the changes out.

So for the STK500, and the AVR core installed in C:\Users\james\AppData\Local\arduino15\packages\arduino\hardware\avr, it uses the "tools.avrdude.program.pattern" in the platform.txt file.

This command contains {program.extra_params} which comes in from the stk500 definition in programmers.txt in the above folder.