Run those apps on XP (VM maybe) and see which functions are missing? You'll have to patch each function after finding it to find the next one though. (just change its string name for testing purposes to something valid, easy search/replace in Hex Editor)
Also, Vista made it possible to use "direct" low level TLS (without APIs) in DLLs loaded with LoadLibrary. Previously this worked only on executables or DLLs loaded statically.
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