Is Windows XP supported?

[Ace (SWE)]

The problem with XP compatibility when building with Visual Studio and MSVC, is that you need to build every single piece of the entire project with a toolset that has XP compatibility. From the smallest dependency and up.
I think one or more of the sub-dependencies of OSG - ones from the official 3rd-party package that I've used - has been built without that compatible toolset, meaning that DLL and anything depending on it won't execute properly on XP anymore.

The easiest way to ensure XP support would be to probably have an XP VM that does the entire build, since that leaves out the possibility for breaking things to sneak in without notice.