Attached (see a few post down) is a 32 bit version of ScriptBasic for Windows that doesn't create a console window. Works great with IUP based GUI programs.
If you want to create a standalone Windows GUI executable without compiling, use the following command like switches with scribaw.
scribaw -Eo myGUIapp.exe myGUIapp.sb
This appends the script to the end of a copy of scribaw which always checks for an attached script before running anything passed to it on the command line.
Another option for small standalone executable scripts is compiling them with C.
scribaw -Co myGUIapp.c myGUIapp.sb
This will create a .exe GUI program in the range of 50 to 100K and use libscriba.dll for the runtime library.