I must say this is disappointing. Many users have a wealth of programs built for XP and many users have clients using XP and these people,for their reasons, will not upgrade from XP, (they are in the thousands, including businesses). Xojo has deprecations and/or exclusions which pretty much means users will have to go back to 2011 or earlier since 2.1 was supposed to be such a big bug fix. And what of the future for users who have clients who may return one or two years after their last purchase of software or consultation?
As mentioned before, you can build your apps for XP just fine so you can continue to support these users. There is only an issue with Real Studio (the IDE itself) running on some XP installations. The easiest workaround is to use a newer version of Windows to do the development.
As for Microsoft's assertion that this was an XP issue, I am a little confused, and skeptical. The machine that I have RS installed on now is running XP Pro. This was originally a Windows 98 machine but I upgraded to XP and went to Pro because Pro was, among other things, supposed to have better memory mangement. I also had another machine,( different brand ), with 2 gigs or ram running XP Home. These two machines had just about every imaginable type of software running on them from paint programs, ray-tracing programs, database programs, batch processing programs that have had the computers running full-tilt for four and five days, software development, and more. Throughout all of this, the only time any programs crashed were "dll hell" issues when I wasn't paying sufficient attention, until I installed Real Studio. Now this system crashes continuously. I should also point out that while pushing the machine with XP Home and running a multi-threaded dll I developed with PowerBasic I actually fried the motherboard but then nothing would run. So, from 1998 to now, the only software that keeps crashing on this cludge of a system I keep going is Real Studio.
I don't have the specific details regarding the memory issue. Certainly XP had better memory management than Windows 98, but you are still talking ancient history here. XP was first released in 2001.