The Qt applications shall be possible to run also in ReactOS system. Please read about this OS. This is OS compatible with WinXP but not proprietary. It is Open Source GPL.

I cannot run Qt Application only because of not compatibility with XP.
There shall be provided workarounds for new API functions present from Vista but not present in Windows XP or if these functions are not needed because are newer used by programmer, these function shall not be loaded at start of application but in runtime via GetProcAddress function.