MSDN documents that REG_MULTI_SZ is not supposed to have \0\0 anywhere else than in the end. The comment in  
https://github.com/python/cpython/blob/a5293b4ff2c1b5446947b4986f98ecf5d52432d4/PC/winreg.c#L504
clearly shows that Python has the assumption that this specification is actually correct. However, Microsoft is violating it eg in https://technet.microsoft.com/en-us/library/cc960241.aspx which prevents you from reading that registry key in Python at all. This is a list which is treated as pairs:
"""
foo

meep
bar
"""
so you can have empty items which in Windows semantics means "remove this file". This results in a string like "foo\0\0meep\0\bar\0\0". I'm proposing relaxing Python registry handling semantics because it's clearly Microsoft isn't following this either