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Windows 95? No problem. Nice new 32 bit API, but it still ran old 
16 bit software perfectly. Microsoft obsessed about this, spending 
a big chunk of change testing every old program they could find with
Windows 95. Jon Ross, who wrote the original version of SimCity for
Windows 3.x, told me that he accidentally left a bug in SimCity 
where he read memory that he had just freed. Yep. It worked fine on 
Windows 3.x, because the memory never went anywhere. Here's the amazing
part: On beta versions of Windows 95, SimCity wasn't working in testing. 
Microsoft tracked down the bug and added specific code to Windows 95 that
looks for SimCity. If it finds SimCity running, it runs the memory 
allocator in a special mode that doesn't free memory right away. That's 
the kind of obsession with backward compatibility that made people 
willing to upgrade to Windows 95.