Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
Are you quite alright? You seem to be hammered. OpenSTM32 is free, what do you mean "sell new product"? To answer your question, yes it is working on WinXP Pro SP3.