I'm writing a small program for a browser game to be shared with some 30-odd people in my alliance. I have no idea what OS they all have, nor do I want to have to care.

As such, I'm writing this program without any references or components; just pure VB6. Any advanced controls will be simulated with userdrawn picture boxes, and data will be handled by reading text files using unix-style Open commands.

My question is: Will they need to install anything to run my exe, or do XP and Vista both ship with the VB6 runtimes? If they do need to install something, what's the easiest way to create an install package that won't install any program, but instead will just install the VB6 runtimes?