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This fixes a load-time failure on versions of Windows too old to have that function in kernel32.dll. We use it to determine whether a file was safe to overwrite in the context of PuTTY session logging: if it's safe, we skip the 'do you want to overwrite or append?' dialog box. On earlier Windows you can use FindFirstFile to get a similar effect, so that's what we fall back to. It's not quite the same, though - if you pass a wildcard then it will succeed when you'd rather it had failed. But it's good enough to at least work in normal cases.