People seem to forget often that backward compatibility doesn't actaully cover all. XP is backward compatible with Fat16 as Fat32 while most 98 programs won't even install let alone run on the newer version there. You can install XP on the older type of partition even while it is usually incompatible to most things. DOSBox couldn't even get the 16bit programs or games like Duke2d running while the 8bit originals saw working results in a "virtual" environment there. Some things will others won't between 64bit and 32bit there too.
Some games and many apps that run in XP either won't work or run too well in the 32bit versoin of Vista. The compatibility problems still come into things. While the 64bit structure sounds like a more stable base to start wtih the market is still 32bit geared. The system requirements for each game or application will be the thing to be looking at to see what it will run on.
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