I tested on a Windows XP platform. a) works fine. b) works fine c) after installing without a problem, I try to open the. hi i have been installed by windows xp sp3 after intallation all program work after i have reboot a dialog box appear that says explorer exe is. EXE is not a valid Win32 application" error message when you try to run Server or Microsoft Windows XP Professional x64 Edition on a. Not sure what the issue is here, but I can only use versions up to v I was running an old version from (!) and finally got around to. hen I download a program an click to install it a box pops up saying the download I am trying to install is not a valid Win32 application. This is a new problem. I have not Windows XP Home Edition ( Service Pack 3) User privileges. Windows Wally answers your questions about Win32 issues and tells you ( WinThruster for Win 10, 8, 7, Vista, XP and – Microsoft Gold Certified). Win32 applications are bit applications that conform to the rules of the Win32 API. Learn more about the biggest issue that the windows OS users face: Not a Valid Win32 Application Error. Get to know the reasons that are.