Hi, I'm sorry to hear that. ImageToMinitel (ImgToVdt) is indeed a Windows command-line utility, so on your virtual machine you'll have to open a Command prompt first. Here is the step by step how-to & troubleshooting https://anto80.com/en-us/image-processing/imgtovdt-image-convert-options-listopt... I hope it helps!
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This is strange. No new window should open when you enter imgtovdt in command prompt. Every action done by the software should also be displayed in the same command prompt window (and not a new window for example).
Could you please capture a video of the commands you entered in the command prompt window?
In which folder did you unzip the executable?
Which native OS are you using?
Thanks